Install Firefox 3.6 add-ons in Firefox 4 beta, disable compatibility check

Posted on June 30, 2010

Firefox 4 beta is available. I installed the 64bit version on Linux today, it’s notably faster than previous versions and includes several other improvements such as tabs on top. Now, I don’t want to go back to 3.6.

As usual the only thing holding me back from upgrading is add-on compatibility. Luckily it’s possible to disable the compatibility check so Firefox 4 will let you install add-ons built for older versions, I found that many add-ons work just fine in Firefox 4.

Disable compatibility check

If you’re willing to take your chances, navigate to about:config in your browser, promise not to break anything and right to window click to add a new boolean. In the preference name field, add extensions.checkCompatibility.4.0b and set the value to false. Firefox will now let you install any add-on.

If anything breaks, try disabling add-ons or delete them completely. You can always go back to 3.6 if nothing works, and wait for a new stable release.

I’ve tested it with AdBlock Plus, Firebug, Flashblock and Wappalyzer.

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JavaScript Tetris

Posted on June 12, 2009

Because I have nothing better to do with my time I wrote a Tetris game in JavaScript. I know there are plenty out there already but it was fun to make and it brought back some memories (I wrote my first Tetris game in DOS when I was 14). Coincidentally, Tetris just turned 25.

I released it under GPL, feel free to grab the code from the source and do whatever you like with it.

Play the game at elbertf.com/tetris

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“Just another WordPress weblog”

Posted on March 24, 2009

I started this blog to write about my on-line projects and share insights and interesting finds on the web. Occasionally I might post a few tips and tricks for programmers and designers.

I’m a programmer myself, I write most of my applications in PHP and JavaScript. I built websites for a living and often work on experimental projects on the side.

This is my first WordPress blog, I used to share science and technology related articles on Blogger but never published any unique content. I also have a discontinued blog on Tumblr where I posted updates about one of my apps, Wappalyzer. I’m going to post the updates here from now on.

WordPress Theme

I started off with the Modicus theme from Upstart Blogger and turned it into something completely different. It’s a work in progress.

Plugins in use

If you’re interested in what I have to say, please subscribe to my feed and follow me on Twitter.

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Fork me on GitHub