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When I open Firefox (8 Beta and 7) and load a page with firebug open, I get a load of javascript strict warnings, so I disable javascript strict warnings so my page loads will speed up, which works until I restart Firefox. Every time I open Firefox, javascript strict warnings are enabled. I even tried turning them off through the about:config settings.

Any ideas on how to keep it off so I don't have to disable strict warnings every time I open Firefox?

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about:config > javascript.options.strict.debug or javascript.options.strict ?? – rlemon Oct 22 '11 at 3:38
Tried those as well. strict.debug is set to false and strict will toggle to false, but when I restart the browser, it's always set to true. – Francis Oct 22 '11 at 8:35
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Have you tried running in safe mode / in new profile? I guess this behavior might be related with some extension, perhaps JavaScript-related extensions. Look in their configuration thoroughly. – jakub.g Oct 22 '11 at 20:59
I disabled all the extensions I had installed, then started enabling them in sets and narrowed it down till I found every time I had PDF Download disabled, Javascript strict errors were disabled. Every time PDF Download was enabled, Javascript strict errors were enabled. So I'm keeping that extension disabled. Thanks for the suggestion! I certainly wouldn't have pegged PDF Download to be the one. I figured maybe any number of CSS or Javascript editors/debuggers I had. – Francis Oct 25 '11 at 17:29
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In about:config, set this option to false:

extensions.firebug.showJSWarnings
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