3 Ways to Install Firefox Extensions

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Learn how to find and install add-ons for Firefox on your computer
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Add-ons and extensions are a great way to customize your web browsing experience on Firefox. They can be powerful tools that change the way Firefox looks, performs, or functions. Firefox has an in-browser interface for add-ons making the installation quick and easy. For users who want extensions not offered in that interface, there are manual installation options as well.

Things You Should Know

  • Easily download add-ons by opening Firefox, going to the three-line menu, and clicking "Add-ons".
  • From that list, click "Install" next to the add-ons you want to install.
  • Alternatively, click "Install for Firefox" for any extensions or add-ons that you find on the web.
Method 1
Method 1 of 3:

Using Firefox to Install Extensions Automatically

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  1. This can be accessed from Start > All Apps (or All Programs) > Firefox on Windows and Applications > Firefox on OSX.
  2. Go to Settings (☰) > Add-ons . This page will display any installed extensions. From here you can update, remove, or search for new extensions and add-ons.
    • This page can also be accessed by typing “about:addons” into the address bar.
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  3. Select "Get Add-ons" if it is not selected by default. Select the search bar and enter your desired extension.
  4. Firefox will automatically download and install the add-on/extension. Firefox will also notify you if a restart is required to use your new extension.
    • An icon for your newly installed add-on will appear in the toolbar on the right. This is often a quick way to access that extension’s settings. [1]
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Method 2
Method 2 of 3:

Using Drag/Drop to Install XPI Files

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  1. This can be accessed from Start > All Apps (or All Programs) > Firefox on Windows and Applications > Firefox on OSX.
  2. Some Firefox add-ons can be acquired outside of the built-in add-on interface. Navigate to the website that hosts your desired extension file and download it. Firefox extension files use the .xpi filetype (cross-platform installer).
    • XPI files can be acquired from external installation links by right-clicking and selecting “Save Link As…” if you prefer to install manually or want installers for archiving purposes.
    • Firefox uses the desktop as the default download destination.
  3. A notification will appears to the left of the address bar that an external source wants to install an add-on.
  4. Press “Install” in the notification and restart Firefox if necessary.
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Method 3
Method 3 of 3:

Installing Extensions Manually from an XPI File

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  1. This can be accessed from Start > All Apps (or All Programs) > Firefox on Windows and Applications > Firefox on OSX.
  2. Some Firefox add-ons can be acquired outside of the built-in add-on interface. Navigate to the website that hosts your desired extension file and download it. Firefox extension files use the .xpi filetype (cross-platform installer).
    • XPI files can be acquired from external installation links by right-clicking and selecting “Save Link As…” if you prefer to install manually or want installers for archiving purposes.
  3. Go to Settings (☰) > Add-ons . This page will display any installed extensions. From here you can update, remove, or search for new extensions and add-ons.
    • This page can also be accessed by typing “about:addons” into the address bar.
  4. From the add-ons interface, press Settings (gear icon) next to the add-on search bar. This will open a menu of add-on specific controls.
  5. This will bring up a file explorer window.
  6. A notification will appear to the left of the address bar that an external source wants to install an add on.
  7. Press “Install” in the notification and restart Firefox if necessary.
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Community Q&A

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  • Question
    What files do I need for Firefox on Mac?
    Community Answer
    To download the Firefox browser, you only need 1 file. On your computer, go to your default browser (all computers have a default browser). And search Firefox download - when the file is finished downloading, you will now be able to use Firefox. Every add-on is 1 file within the Firefox browser.
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      Tips

      • If extensions still cannot be installed: Type "about:config" into the address bar and hit enter. This produces a list of all the many preferences. Then, scroll down to "xpinstall.enabled." Under "Value" on the right side of the page, make sure the value is "true." If it is false, double-click and it will change to true. Leave the page by clicking a new tab or going to your homepage.
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      Warnings

      • Obsolete add-ons are disabled by default. They can be re-enabled on the add-ons page, but enabling them may cause performance or stability issues.
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      • Use caution when installing unverified add-ons. The in-browser add-ons page is the most trusted source.
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      References

      1. ↑ https://support.mozilla.org/en-US/kb/find-and-install-add-ons-add-features-to-firefox

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