Firefox 3 beta 2 and incompatible extension workarounds

I had posted earlier on my initial experiences with the Firefox 3 beta inside a sandbox, and decided to hold off on a full time switch to the beta as most of my favourite extensions were incompatible. The incompatibility status for the extensions has not changed, but I discovered an easy workaround (no hacking around xpi) today when looking around for a working mousse gestures extension.

All I had to do was to create a “extensions.checkCompatibility” boolean field in the Firefox about:config and set it to false. As you can guess, this disables the compatibility check for the extensions, and all the disabled incompatible extensions are enabled (with warning messages). Of course, this does not guarantee that the extension will work. Also the browser crashed on the first restart (the subsequent restart was fine though).

However, I was able to get most of the required extensions working this way (not extensively tested). They include Mouse Gestures, bookmarks, Greasemonkey (Update 22/01/2008: Greasemonkey just got an update today and is now supported on Firefox 3 beta), MR Tech Local Install (this one can override extension compatibility versions) and PDF download. Some extensions remain unusable though like Tab Mix Plus (possibly due to the architectural changes) and Google Gears (might be because I’m running inside a sandbox). Not a major loss, though I miss some of the tab tweaks provided by Tab Mix Plus.

I plan to use the beta inside the sandbox as my primary browser now that the extensions problems has been worked around. I’ll post my findings in in a few weeks, by which time some updates are likely to be available.

As for the changes from beta 1 to 2, check out the release notes. Of note is the fact that the rich interfaces of Yahoo Mail and Windows Live Mail are still unsupported.

There seem to be further tweaks to the memory usage (image below) and rendering. The interface hasn’t changed much, though a Smart Bookmarks folder seems to have been added to the bookmarks toolbar. The earlier location bar update that includes suggests autocomplete entries based on the page titles and not just the link text is quite a useful feature.

And to sign off here’s a comparison of the memory usage of v2 (top – gray) vs v3b2 (bottom – blue) with the same 8 tabs open in each, taken using process explorer. Note that there are fewer extensions in v3b2 and it is running in a sandbox.

Firefox 2 vs 3b2

32 thoughts on “Firefox 3 beta 2 and incompatible extension workarounds

  1. Hi Helder. You need to create the variable in case it is not present. Just open the about:config page in Firefox, right click and create a new boolean variable with the said name and set it to false.

  2. Hi!
    First of all thanks for this article!
    I’d like to provide additional receipt to turn ON those extensions that left locked even after applying extensions.checkCompatibility.
    Here is another one parameter: extensions.checkUpdateSecurity.
    Set it to ‘false’ and all of those extensions that has unsecure update URL in section will be unlocked!

  3. I tried the hack and most of my extensions now work in FireFox 3

    Anyone know how to get “Always Remember Password” to work in
    FireFox 3

  4. Well, that is my first take a look at to your blog! We are a group of volunteers and also starting a brand new initiative in a local community in the same niche. Your blog provided us valuable information to work on. You have done a marvellous work!

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