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CLEO 4.1

CLEO allows you to organize individual extensions/themes by combining them together into a single, installable file. This file can be used to install or restore a collection of extensions and/or themes.

You may have a list of your favorite extensions/themes that you would like to share with others. With CLEO, you can gather them all together into a single file (called, perhaps, "My favorite add-ons") and post it on a webpage or email it to family, friends and co-workers. They can install the whole batch with a just a couple of clicks! (e.g., File > Open Fileā€¦)

Useful tool for developers: I, as an extension developer, have several different Firefox profiles. Whenever I start a new extension, I create a new profile for testing, debugging, etc. In this profile, I like to have a dozen or so developer related extensions installed. With CLEO, I can package all these extensions together and install them into a new profile with just a few clicks.

Once installed, CLEO is available from the Firefox Tools menu. An icon can be placed on the toolbar via (right-click on toolbar) > Customize...

*Available elsewhere on this Mozilla site (

User's rating:

  • Currently 3.67/5
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Download 0.04MB CLEO

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(0.04MB, Extension: XPI)

History updates (Complete changelogs since the listing on this site)

4.1 [05-04-09]

Maxversion bump and locale update

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Predicted future versions and notices:

The constantly monitors the update of all programs, including information from the CLEO 4.1 changelog file, however sometimes it can happen that data are not complete or are outdated.We assume that author continue's to develop 4.2 version with further advanced features, and soon you will be informed. Equally important 5.0 upgrades of the program we will continue to monitor. Full CLEO description has been compared with the overall software database and our algorithm has found the following applications (are showed below).