Download Formidable

Name: Formidable
Author: vifito

By: vifito Add-on

Download Formidable (current and past versions) for Firefox

Latest Version: 1.2.0 Updated: 20 days ago

Ready to install?

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

View source code

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Available versions

You can find the current and older versions of Formidable 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

Version	Download	Size	Download count	Timestamp
1.2.0	XPI · ZIP · Source code	855.14KB	0	2026-08-20
1.1.0	XPI · ZIP · Source code	853.47KB	0	2026-08-18

2026-08-20 · 0 downloads

XPI ZIP Source code

2026-08-18 · 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 Formidable ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Formidable ZIP file from step 1. Formidable is now installed on your browser.