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To configure Firefox tabs so that they always show all tabs by shrinking their width, you can use the following methods:

Method 1: Firefox's Built-in Tab Scrolling

Firefox automatically shrinks tab widths when there are too many tabs to fit in the tab bar. If the tabs become too narrow, Firefox will add a scrollbar to the tab bar, allowing you to scroll through them. This behavior is enabled by default, and it is not possible to change this setting in the configuration menu.

Method 2: Customize Tab Width with userChrome.css

If you want more control over the tab width, you can use a custom userChrome.css file to set a minimum width for tabs. This will ensure that tabs shrink to a specific width before Firefox starts scrolling.

1. Enable the userChrome.css file:

   • Open Firefox and type about:config in the address bar, then press Enter.

   • Accept the warning to proceed.

   • Search for toolkit.legacyUserProfileCustomizations.stylesheets.

   • Set the value to true.

2. Locate your Firefox profile folder:

   • Type about:support in the address bar and press Enter.

   • Under the "Application Basics" section, find the "Profile Folder" entry and click "Open Folder" (or "Show in Finder" on macOS).

3. Create or edit the userChrome.css file:

   • In the profile folder, navigate to the chrome folder (create it if it doesn’t exist).

   • Inside the chrome folder, create or edit a file named userChrome.css.

4. Add the following CSS code to userChrome.css:

   css

   Copy

   /* Set a minimum tab width */
   .tabbrowser-tab {
       min-width: 100px !important; /* Adjust the width as needed */
   }
   
   /* Ensure tabs shrink instead of scrolling */
   .tabbrowser-tab[fadein]:not([pinned]) {
       flex-grow: 1 !important;
   }

5. Restart Firefox:

   • Close and reopen Firefox for the changes to take effect.

Method 3: Use a Firefox Add-on

You can also use a Firefox add-on to manage tab behavior. One popular add-on is Tab Center Reborn, which provides more control over tab layout and width.

1. Install the Tab Center Reborn add-on.

2. Configure the add-on settings to adjust tab width and behavior according to your preferences.

Method 4: Adjust Firefox's about:config Settings

You can tweak Firefox's internal settings to control tab behavior:

1. Open about:config in the address bar and press Enter.

2. Search for browser.tabs.tabMinWidth.

3. Set the value to a smaller number (e.g., 50) to allow tabs to shrink more before scrolling.

By using one of these methods, you can ensure that Firefox tabs shrink to fit the available space, making it easier to view all tabs without scrolling.