CompatLens Firefox

Download CompatLens

Download CompatLens (current and past versions) for Firefox
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Modify request and response headers. No ads, no malware.
Latest Version: 1.0.0 Updated: 19 days ago

Ready to install?

CompatLens is available to install from Firefox Add-ons Store and for download from this page.
View source code

Available versions

You can find the current and older versions of CompatLens 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
1.0.0XPI · ZIP · Source code171.44KB02026-08-20
1.0.0 171.44KB
2026-08-20 · 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 CompatLens ZIP file.
  • In Firefox browser, go to about:addons to open Add-ons Manager
  • Click on ⚙, Install Add-on From File
  • Select the CompatLens ZIP file from step 1. CompatLens is now installed on your browser.

Best CompatLens Alternatives

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