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# Advanced Preferences

This section describes how to use the Advanced preferences panel. If you are not already viewing the panel, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Click the Advanced category.

In this section:

- Advanced
- Scripts & Plugins
- Keyboard Navigation
- Cache
- Proxies
- HTTP Networking
- Software Installation
- Mouse Wheel
- DOM Inspector

## Advanced Preferences - Advanced

This section describes how to use the main Advanced preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Click the Advanced category.

The main Advanced preferences panel allows you to enable or disable Java:

- Enable Java: Select this to allow &brandShortName; to interpret pages containing Java. Java is used on some Web page to incorporate interactive and multimedia content.
- Use Preferences from System: Select this to use the already set system preferences, overriding &brandShortName;' ones.

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## Advanced Preferences - Scripts & Plugins

This section describes how to use the Scripts & Plugins preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Scripts & Plugins. (If no subcategories are visible, double-click Advanced to expand the list.)

The Scripts & Plugins preferences panel allows you to control how JavaScript and plugins are used:

- Enable JavaScript for:
  - Browser: Select this to turn on JavaScript for web pages opened in the browser.
- Allow scripts to: Select these checkboxes to control how JavaScript can be used:
  - Move or resize existing windows: Allows open windows to be resized or moved.
  - Raise or lower windows: Allows windows to be placed under or on top of other windows.
  - Hide the status bar: Allows the status bar to be hidden.
  - Change status bar text: Allows status bar text to be changed, such as in scrolling text in the status bar.
  - Change images: Allows images to be changed or animated, such as in image rollovers (images that change when the mouse cursor is placed over them).
  - Disable or replace context menus: Allows right-click menus or, if you're using a one-button mouse, `Ctrl`-click menus to be replaced or disabled by webpages.
- Enable Plugins for: Check this checkbox to control how plugins are used:
  - Mail & Newsgroups: Allows plugins to be used in Mail & Newsgroups.
- When additional plugins are required: Check this checkbox if you want to be informed whenever a website requires additional plugins:
  - Display a notification bar at the top of the content area: When a website requires a plugin which is not installed, a notification bar will be displayed above the website content area. From the bar you will be able to download and install the missing plugin.

For more information about plugins, see Plugins and Downloads.

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## Advanced Preferences - Keyboard Navigation

This section describes how to use the Keyboard Navigation preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Keyboard Navigation. (If no subcategories are visible, double-click Advanced to expand the list.)

The Keyboard Navigation preferences panel allows you to control how you use the keyboard to navigate and search for text in web pages:

- Links: If checked, pressing `Tab` or `Shift`+`Tab` moves between links.
- Buttons, radio buttons, check boxes, and selection lists: If checked, pressing `Tab` or `Shift`+`Tab` moves between buttons, radio buttons, check boxes, and selection lists.
- Find automatically when typing within a web page: If checked, typing text in a web page automatically activates Find As You Type and locates the text you typed (if it exists in the page). Choose whether you want typing to find any text in the page or links only. If unchecked, you must choose Find Links As You Type or Find Text As You Type from the Edit menu before typing the text you want to find.
- Play a sound when typed text isn't found: If checked, Find As You Type plays a sound when the typed text isn't found in the web page.
- Clear the current search after a few seconds of inactivity: If checked, cancels the search after a few seconds of keyboard inactivity.

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## Advanced Preferences - Cache

This section describes how to use the Cache preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Cache. (If no subcategories are visible, double-click Advanced to expand the list.)

The Cache preferences panel allows you to adjust the &brandShortName; memory and disk cache:

- Size: Type in the amount of disk cache you want to allocate for &brandShortName;. Disk cache is saved to your hard disk (drive) and can be used again even if you have turned your computer off.
- Clear Cache: Click this to clear the disk cache.
- Cache Folder: Shows the current location of the disk cache folder
  - Choose Folder: Click this to choose a folder location for the disk cache.
- Compare the page in the cache to the page on the network:
  - Every time I view the page: Select this if you want &brandShortName; to compare a web page to the cache every time you view it.
  - When the page is out of date: Select this if you want &brandShortName; to compare a web page to the cache when the page is determined by the server to have expired.
  - Once per session: Select this if you want &brandShortName; to compare a web page to the cache once for each time you start &brandShortName;.
  - Never: Select this if you do not want &brandShortName; to compare cached information to the network.
- Prefetch web pages when idle, so that links in web pages designed for prefetching can load faster: Select this to decrease the time it takes to load web pages when you click a link in a web page that uses prefetching. For more information about Link Prefetching, see the online Link Prefetching FAQ.

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## Advanced Preferences - Proxies

This section describes how to use the Proxies preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Proxies. (If no subcategories are visible, double-click Advanced to expand the list.)

The Proxies preferences panel allows you to set up &brandShortName; to use a proxy:

Before you start: Ask your network administrator if you have a proxy configuration file or for the names and port numbers of the proxy.

- Direct connection to the Internet: Choose this if you don't want to use a proxy.
- Automatically discover the proxy configuration: Choose this if you want &brandShortName; to automatically detect and configure the proxy settings, using the WPAD protocol.
- Automatic proxy configuration URL: Choose this if you have a proxy configuration file or URL, then enter the configuration URL.
  - Reload: Click this to reload the configuration file.

    For more information about Automatic Proxy Configuration, see the online End User Guide to Proxy AutoConfiguration.

- Manual proxy configuration: Choose this if you don't have a proxy location (URL), or the automatic proxy discovery was unable to setup the proxy settings correctly.
  - Proxy: Enter the name or numeric IP address of the proxy server.
  - Port: Enter the port number in the Port field. Click on Advanced to set Advanced Proxy Preferences
  - No Proxy for: Type the domains and/or IP addresses that you do not want to use a proxy for. Separate each entry with a comma. (Example: `.mozilla.org, .net.nz, 192.168.1.0/24`.)

### Advanced Proxy Preferences

If you want to use different proxies for different protocols or need to use a SOCKS proxy:

- HTTP Proxy, SSL Proxy, FTP Proxy: Enter the name or numeric IP address of the proxy server. Type the port in the Port fields.

  Note: If you're using the same settings for all types of proxies, click on Use HTTP Proxy settings for all protocols.

- SOCKS Proxy: Enter the name or numeric IP address of the proxy server. Enter the port number in the Port field.
  - SOCKS v4, SOCKS v5: When entering a SOCKS Proxy, select SOCKS v4 or SOCKS v5, depending on what version of SOCKS is used for the proxy.
  - Use for resolving hostnames: Select this to use the SOCKS Proxy for resolving hostnames. This is recommended for SOCKS v5 proxies.

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## Advanced Preferences - HTTP Networking

This section describes how to use the HTTP Networking preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click HTTP Networking. (If no subcategories are visible, double-click Advanced to expand the list.)

The HTTP Networking preferences panel is used to configure HTTP-based networking:

- Direct Connection Options, Proxy Connection Options: Choose the HTTP version and options for direct and proxy connections.
  - Use HTTP 1.0: Choose this to use the original version of HTTP, standardized in 1996.
  - Use HTTP 1.1: Choose this to use the new version of HTTP, which offers performance enhancements, including more efficient use of HTTP connections, better support for client-side caching, multiple HTTP requests (pipelining), and more refined control over cache expiration and replacement policies.
  - Enable Keep-Alive: Select this to keep a connection open to make additional HTTP requests, increasing speed.
  - Enable Pipelining: Select this to enable pipelining, which allows for more than one HTTP request to be sent to the server at once, reducing delays loading web pages.

    Note: Pipelining is only available with HTTP 1.1.

- User Agent String: The identifier sent by &brandShortName; to all websites is used for statistics about website usage but also sometimes to expose certain features only to known browsers (a practice known as "sniffing").
  - Advertise Firefox compatibility: If this is enabled, &brandShortName; will identify itself as both &brandShortName; and also compatible with Firefox. This allows websites that check for certain browsers rather than certain functionality to work with &brandShortName;.

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## Advanced Preferences - Software Installation

This section describes how to use the Software Installation preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Software Installation. (If no subcategories are visible, double-click Advanced to expand the list.)

The Software Installation preferences panel is used to enable software installation and update notification:

- Allow websites to install extensions and updates: Select this if you want to allow websites to install extensions and updates to be used with &brandShortName;. You will be prompted before each installation.
- Allowed Websites: Click this to open the Allowed Websites dialog box, where you can view and edit the list of websites that you want to allow to install software:
  - Allow: Click this to add a typed website to the list of allowed websites.
  - Remove Website: Click this to remove a selected website.
  - Remove All Websites: Click this to remove all of the websites in the current list.
- Automatically check for updates to:
  - &brandShortName;: Select this to be notified when new versions of &brandShortName; are available. Your personal information is not shared when verifying your version of &brandShortName;. Choose whether you want &brandShortName; to do a daily or a weekly check for new versions.
  - Installed Add-ons: Select this to be notified when a new version of one of your installed add-ons is available. Choose whether you want &brandShortName; to do a daily or a weekly check for new versions.
- Add-on Manager: Click this to open the Add-on Manager, where you can view and manage all your installed extensions and themes.
- When updates to &brandShortName; are found:
  - Ask me what I want to do: Select this to be notified when new versions of &brandShortName; are available.
  - Automatically download and install the update: Select this if you want &brandShortName; to automatically download and install updates for you when they become available. The download will happen in the background, with low priority. After the download has finished the update will be installed automatically the next time you start &brandShortName;.
  - Warn me if this will disable any of my add-ons: Select this to be notified if an automatic update will disable any of your installed add-ons. In that case you will be shown a list of incompatible add-ons and you can choose whether you want to download and install the update or not.

  Note: You can use Check for Updates from the &brandShortName;Help menu to manually initiate the search for a &brandShortName; update. The label of the menu item will change when an update is being downloaded or ready to be applied.

- Show Update History: Click this to open the Update History dialog box which shows a list of &brandShortName; updates that have been installed, including the update type (e.g. Security Update), time of installation and installation status. The Details link next to each update takes you to a web page that contains further information regarding the update.

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## Advanced Preferences - Mouse Wheel

This section describes how to use the Mouse Wheel preferences panel. If you're not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click Mouse Wheel. (If no subcategories are visible, double-click Advanced to expand the list.)

The Mouse Wheel preferences panel allows you to control how the mouse wheel on your mouse (in between your mouse buttons) is used in &brandShortName;. Modern mice may have two wheels or a button that can be used to switch the scroll direction of the wheel. The behaviour for the vertical wheel function is set in the upper panel Vertical scrolling while the horizontal mode is controlled by the lower panel Horizontal scrolling.

- Select No modifier key or select a key that you want to use along with the mouse wheel. Use the checkboxes below to configure mouse wheel behavior:
  - Scroll the document by: Choose this to scroll the document by the number of lines (or characters for horizontal movement) typed in the field.
    - Use system default: Choose this to use your system's default setting—the number of lines (characters) you may have previously entered will be overridden. Read your system's documentation to find out where to change the system default mouse wheel/scroll settings.
  - Scroll a page up (left) or a page down (right): Choose this to scroll up or down one page at a time. This setting allows faster, but less accurate scrolling through a page with your mouse wheel.
  - Move back and forward in the browsing history: Choose this to use the mouse wheel to navigate back or forward to previous pages you've visited.
  - Make the text larger or smaller: Choose this to use the mouse wheel to increase or decrease the size of text on a web page. This setting can help you better read a page, or make text fit on the screen.

  Note: Each modifier key can be assigned to a different function.

- If your mouse does not have a mode for horizontal scrolling, any setting in the lower panel Horizontal scrolling will be ignored.

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## Advanced Preferences - DOM Inspector

DOM Inspector is an optional Web development component. This section describes how to use its preferences panel. If you are not already viewing it, follow these steps:

1. Open the &brandShortName; Edit menu and choose Preferences.
2. Under the Advanced category, click DOM Inspector. (If no subcategories are visible, double-click Advanced to expand the list.)

When you select an element, DOM Inspector can automatically highlight it by flashing it or its border:

- Blink Selected Element: Check this option to enable the highlighting of an element that you select. By default, a flashing border will appear around the element.
  - Border Color: Select the color of the border around the element.
  - Border Width: Enter the width of the border around the element.
  - Blink Duration: Enter the length of time (in milliseconds) for which you want the flashing to occur.
  - Blink Speed: Enter the time interval (in milliseconds) between the flashes.
  - Invert Color: Check this option to paint the selected element with the inverted border color. This will cause the whole element—including its border—to flash.