Cobalt3 Firefox

Download Cobalt3

By: Cobalt
Download Cobalt3 (current and past versions) for Firefox
Latest Version: 1.0 Updated: 4 years ago Removed

Ready to install?

Cobalt3 is available for download. Be careful when installing it.
View source code

Available versions

You can find the current and older versions of Cobalt3 here. You can download the archived versions or inspect their source codes.

As a free user, you can download up to 3 latest versions.
Upgrade to download older versions
VersionDownloadSizeDownload countTimestamp
1.0XPI · ZIP · Source code7.46KB02022-09-25
1.0 7.46KB
2022-09-25 · 0 downloads

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.
  • Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

  • Download the Cobalt3 ZIP file.
  • In Firefox browser, go to about:addons to open Add-ons Manager
  • Click on ⚙, Install Add-on From File
  • Select the Cobalt3 ZIP file from step 1. Cobalt3 is now installed on your browser.

Best Cobalt3 Alternatives

Here are some Firefox add-ons that are similar to Cobalt3: