: Page Speed no longer working for Firefox 4? Hey there, I love Google's little Page Speed tool, I've seen some wonderful speed advances on sites I've worked on because of it, but since I've

@Kevin317

You didn't mention which specific version you were working with, but there was a release candidate posted to the PageSpeed Google Group last week that seems specifically targeted at v4. (Current version is 1.10, that RC is for 1.11.x)
Might be better than hacking the compatibility value and hoping the UI changes don't blow anything up too badly.

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@Cooney921

If an extension does not have official support for Firefox 4, you can choose to bypass the version checking in Firefox:


In the address bar enter about:config (read & accept any warnings to proceed)
Right-click and select New > Boolean from the menu
Enter extensions.checkCompatibility.4 for the preference name
Enter false for the preference value


Firefox should now allow you install extensions which aren't explicitly compatible with v4.*, although you might need to restart Firefox for the setting to take effect.

If you had the extension installed when you upgraded to 4, you probably still have it installed: you can check in about:addons.

Once the compatibility check is disabled, you should be able to enable any previously blocked extensions.

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