User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 6.0; rv:2.0) Gecko/20100101 Firefox/4.0 what happened:TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined Reproducible: Always happens everytime I try to load Firefox, I do not understand some of these questions, I am not a computer techie
Do you still get that error message if you start in Safe Mode? https://support.mozilla.com/en-US/kb/Safe+Mode Or with a new, clean profile? https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-profile
Component: General → Add-ons Manager
Product: Firefox → Toolkit
QA Contact: general → add-ons.manager
Sounds like you have some extension installed that is trying to use things not present in Firefox 4.
Component: Add-ons Manager → Extension Compatibility
Product: Toolkit → Firefox
QA Contact: add-ons.manager → extension.compatibility
Status: UNCONFIRMED → RESOLVED
Last Resolved: 8 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 650093
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