Configuring Firefox with About:Config

Have you wondered how you might change settings in Firefox, yet not found any options in the Tools | Options... section? Firefox uses a file called About:Config to manage options that are not configurable through the Tools | Options... menu. Just type About:Config in the Address Bar to access these additional options.
The Mozilla knowledge base has a list of options to set. Here are just a few that may be of interest to you.
  • Set the check document frequency (browser.cache.check_doc_frequency): This is the option as to how frequently the browser check to see if the page has been update.
    0: Check once per browser session
    1: Check every time you view the page
    2: Never check (always use the cached page)
    3: Check when the page is out-of-date (default)
  • Default Search ( Just as the name says. The default is Google,
  • Search Open ( Set to true and your search results will open in a new tab. The default of false will return in the current window.
  • Browser Tab Close Button (browser.tabs.closeButtons): This is the option to where you want the close button for each tab:
    0: Display a close button on the active tab only
    1: Display a close button on each tab (default, Firefox 2)
    2: Do not display any close buttons
    3: Display a single close button at the end of the tab bar (old Firefox behavior)

To make a change on the About:Config page, double-click to toggle between true and false or to open the value dialog box. Alternately, right-click on a line to toggle or modify a value. Likewise, if you know what you are doing, you can right-click to add new properties.


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