Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Chrome has a significantly more restricted extension API than Firefox; it mainly just consists of content scripts (with background pages) and a couple of hooks for context menus and popups and such. As such, it seems to me that a very significant subset of the Chrome API could be implemented in Firefox, either as a Firefox extension or a separate "extension compiler" like there exists for Greasemonkey scripts (which, incidentally, are another example of something that works exactly the same way as Chrome content scripts). If implemented, this would allow most Chrome extensions to install and run in Firefox.

I Googled around a bit and found several mentions of a very old attempt at this, but all of the links to the actual Mozilla repository for it are now dead. Even if they weren't, I'd be very surprised if this early effort still worked with either Firefox 4 or the latest changes to the Chrome extension API.

So my question is, does anybody know what the current state of the art is with regards to Chrome Extension API compatibility layers in Firefox? Have there been any extensions or extension compilers attempting to address the issues I brought up?

share|improve this question
1  
The source code of the Firefox add-on you mention is on BitBucket –  niutech Mar 4 '13 at 0:09

2 Answers 2

up vote 5 down vote accepted

If there is such a beast, even Mozilla developers don't know about it!

Many Chrome "extensions" are just Greasemonkey scripts, and these can be used with the Greasemonkey extension or compiler on Firefox with no changes.

Unfortunately, extensions that use other APIs must be ported. If you're looking to port a Chrome extension to Firefox, or planning to write one for both, take a look at Mozilla's new Jetpack extension API, which was designed to work in a manner similar to the way Chrome's extensions work, but still offer the vastly increased access to the browser the original Firefox API is known for.

share|improve this answer
    
In that case, how can Chrome extensions be installed as GreaseMonkey scripts? (I think most (or all) of the Chrome extensions use the .crx file format.) –  Anderson Green Oct 30 '12 at 3:47

You can use You can use Extension Factory conversion tool in order to convert a Google Chrome extension to Firefox or Safari.

share|improve this answer
1  
It no longer works, I tried. –  JatSing May 9 '13 at 17:24

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.