Why so serious Firefox

Download Why so serious

By: Devyne
Download Why so serious (current and past versions) for Firefox
Latest Version: 2.0 Updated: 7 years ago Removed

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Why so serious is available for download. Be careful when installing it.
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Available versions

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

As a free user, you can download up to 3 latest versions.
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VersionDownloadSizeDownload countTimestamp
2.0XPI · ZIP · Source code99.40KB02019-05-15
2.0 99.40KB
2019-05-15 · 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

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

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