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?
Ŋuɖoɖo si wotia
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode 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 Safe mode:
- Help > Restart with Add-ons Disabled
- Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)
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All Replies (2)
Ɖɔɖɔɖo si wotia
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode 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 Safe mode:
- Help > Restart with Add-ons Disabled
- Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)
Thank you. The problem appears to have been with the theme "Firefox 3 Theme for Firefox 4+." After switching to the default theme, "Default 5.0," the JavaScript error doesn't appear.