WHAT Firefox

Download WHAT

By: YAHYA MANSOUB Add-on
Download WHAT (current and past versions) for Firefox
Latest Version: 1.0.0 Updated: 2 months ago

Ready to install?

WHAT is available to install from Firefox Add-ons Store and for download from this page.
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Available versions

You can find the current and older versions of WHAT 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 code226.44KB02026-06-06
1.0.0 226.44KB
2026-06-06 · 0 downloads
XPI ZIP Source code

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

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