... because I keep forgetting how.

There is no guarantee that your Extensions will work, but they will try. For example, Gmail Manager has some display issues, but it's good enough.

  • Type about:config into Firefox's address bar and click the "I'll be careful, I promise!" button.
  • Right-click anywhere. Choose New>Boolean. Make the name of your new config value extensions.checkCompatibility and set it to false.
  • Make another new boolean pair called extensions.checkUpdateSecurity and set the value to false.
  • Restart Firefox.

Thanks, Lifehacker!

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