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Error Message

  • 4 답장
  • 1 이 문제를 만남
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  • 최종 답변자: sdevoe

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Error message: "what happened:TypeError:Components.classes['@mozilla.org/extensions/manager;1'] is undefined"

This happens: on eBay: link to enlarge pictures on Eudora: link to url Firefox: on starting Firefox

Error message: "what happened:TypeError:Components.classes['@mozilla.org/extensions/manager;1'] is undefined" This happens: on eBay: link to enlarge pictures on Eudora: link to url Firefox: on starting Firefox

선택된 해결법

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).


This can be a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.

문맥에 따라 이 답변을 읽어주세요 👍 0

모든 댓글 (4)

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선택된 해결법

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).


This can be a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.

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Well, I played around in Mozilla and finally went into McAfee and removed Site Advisor 3.3.1. So far, the error message hasn't appeared in one of the annoying areas. Will let you know after further testing if the problem has been completely eliminated or not. Thanks.

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Please click the Solved It button next to the answer that solved your Firefox support issue, it appears when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.

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Thanks for telling me about this--I didn't see it and didn't know I should click it.