How to make old extensions work in Firefox 3.5

Mozilla Firefox 3.5 was released a few days ago. This is great news for us web developers, but not all add-ons have been updated to be compatible with the new version yet, YSlow being one of them. You can force an incompatible extension to work with Firefox 3.5 by disabling the compatibly check that Firefox performs before each install.

Instructions

• Type “about:config” (without quotation marks) into the address bar and click the Agree button
• Right-click anywhere in the window and choose New – Boolean. Name the new config value “extensions.checkCompatibility” (without quotation marks) and set it to false
• Restart Firefox

NOTE: This might lead to unexpected behavior or even a crash. Make sure that you properly backup your add-ons before editing.

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