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Make extensions work in Firefox 3 beta 5

By   |  April 8, 2008

If you haven’t yet started using Firefox 3 beta 5, the last of the betas before final release, then you’re missing out. Firefox3b5 is quick, very quick, lean and much better to use than Firefox 2. Firefox 3 is also neatly integrated into Mac, Windows and Linux desktops and uses native icons and themes. Javascript has also been siginficantly improved in Firefox3b5 making it noticeably quicker using online apps such as Google Mail and others.

If you are already using a Firefox 3 beta then the one thing that is a frustration is that most of your popular extensions will claim to not be compatible with the latest release. In most cases it is simply that developers haven’t yet made their extensions compatible with Firefox3b5. But this doesn’t mean that most of them wont work. (We love our Firefox extensions. See: Web design tools for Firefox, Power browsing with the best Firefox add-ons)

A simple way to get extensions to work is to download the Nightly Tester Tools extension. When you’ve installed NTT and restarted Firefox, the Add-ons dialog box will include a “Make all compatible” button. Hit that button to tell Firefox to assume that all of your extensions are compatible and load them. You’ll need to restart Firefox one more time and then you’ll be able to enjoy all your favourite extensions again. Even after employing NTT you may still get some warnings about incompatibilities with extensions. The hide those annoying reminders have a look at this guide to edit the about:config settings. [Via Lifehacker]

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7 Responses to “Make extensions work in Firefox 3 beta 5”

  1. Amir
    April 8th, 2008 @ 9:35 am

    why not simply disable version checking on extensions, rather then adding yet another extension. This can can be added by going to the URL ‘about:config’.

    Right click on the list and choose ‘New’, followed by ‘Boolean’.

    Enter the name ‘extensions.checkCompatibility’ and set the value to ‘false’.

    Restart your browser, voilla all your extensions are working

  2. Alastair Otter
    April 8th, 2008 @ 9:57 am


    Using Nightly Tester Tools is simple and easy. Sometimes that is what we want. But you’re right, you could edit the about:config settings. Which is why I included a link to doing exactly that at the end of the piece.

  3. Mike Kroger
    April 9th, 2008 @ 1:49 pm

    As a long time Firefox extension developer (Almost 4 years), I feel I should say that I think it’s quite irresponsible to encourage the average Firefox user to work around the version checking.

    Nightly builds, and thus Nightly Tester Tools, are not intended for “general human consumption.” They are supposed to be used ONLY for testing purposes, and generally reserved for those who know what they are doing.

    It is an unfortunate fact that many (I assume teenagers on a quest to impress their girlfriends) install nightly builds (AKA Minefield… For very good reasons) without fully understanding that nightly builds very often contain regression bugs.

    Those who KNOW what they are doing are quite capable of bumping maxVersion, and repacking the XPI, without the use of tools. Those that lack the knowledge to bump maxVersion should stay away from nightly builds, and they should respect the version numbering enforced by the developer.

    There is good reason to respect version numbering enforced by the developer. It usually means that he/she hasn’t had the time to test their code on that particular version of Firefox, which could mean that any number of things could go wrong, especially if their code ties into Places.

  4. Alastair Otter
    April 9th, 2008 @ 8:29 pm


    I’m sorry if you think we’re being irresponsible. But, to be honest, people that are running the very latest beta of Firefox (and read Tectonic) are not likely to be users that can’t deal with an occasional problem or two, if they do indeed occur. Most of them are probably running beta versions of Ubuntu Linux or some other distro on their desktop. So they are not the uninitiated.

    But your points are taken and thank you for your comments.

    And keep up the great extension work!

    April 10th, 2008 @ 7:14 pm

    Firefox 3 beta 5 mit gewöhnten Extensions/Plugins nutzen…

    Die letzte beta vor dem finalen Firefox 3 Release soll verdammt schnell sein, leider laufen die meisten der gewohnten alten Erweiterungen laut Aussagen der Entwickler nicht unter Firefox 3. Lifehacker und Tectonic beschreiben einen simplen Weg wie man …

  6. bhaskar
    May 5th, 2008 @ 3:18 pm

    i can’t download it
    it’s says waiting and then it’s just goes away and it does not download

  7. Alastair
    May 5th, 2008 @ 4:01 pm

    If you’re referring to Nightly Tester Tools then I suspect it must be a temporary problem on your side. I just downloaded that again from

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