Javascript error when starting Firefox 5
I've just upgraded Firefox from 4.0.1 to 5. Now when I start Firefox, the following error message appears:
JavaScript Application
TypeError: Components.classes[cid] is undefined
When I click the OK button, Firefox loads. It looks normal, and seems to behave normally. I have Java Version 6 Update 26 installed (Windows XP), which is the latest version.
Seems to be a Firefox problem, as I didn't have it before with the same version of Java installed. Is there a Firefox setting that needs to be changed, or is it maybe a Firefox bug?
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
In Firefox 4 you can use one of these to start in <u>[[Safe mode]]</u>:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
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'''bold text'''Clear the cache and the cookies from sites that cause problems.
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