Download Four20
Download Four20 (current and past versions) for Firefox
Four20 is available for download. It had 1 daily users before it was removed from Firefox Browser Add-ons on 2025-03-26, and it has been downloaded from Firefox-Stats 0 times. Be careful when installing it.
Total download count: 0 (Only count downloads from Firefox-Stats)
Available versions
You can find the current and older versions of Four20 here. You can download the archived versions or inspect their source codes.
As a free user, you can only download the latest version.
Upgrade to download older versions
| Version | Download | Size | Download count | Timestamp |
|---|---|---|---|---|
| 2.0 | XPI · ZIP · Source code | 1.06M | 0 | 2019-05-13 |
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 Four20 ZIP file
- In Firefox browser, go to
about:addonsto open Add-ons Manager - Click on , then select Install Add-on From File
- Select the Four20 ZIP file from step 1. Four20 is now installed on your browser.
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