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Firefox always say: Couldn't load XPCOM !

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Hello supporters

I've restart my pc then run firefox and it show up message Couldn't load XPCOM

I've uninstalled it many times

Then delete all file from my pc belongs to firefox And the problem still exist

I've deleted from roaming, local, programs files, register And still same problem

I've used software for complete uninstallation for firefox and the problem still exist

Please tell how to fix this problem ?

I discarded all files belongs to firefox but it show up same message every time I run it and I can't browse any page from it

Hello supporters I've restart my pc then run firefox and it show up message Couldn't load XPCOM I've uninstalled it many times Then delete all file from my pc belongs to firefox And the problem still exist I've deleted from roaming, local, programs files, register And still same problem I've used software for complete uninstallation for firefox and the problem still exist Please tell how to fix this problem ? I discarded all files belongs to firefox but it show up same message every time I run it and I can't browse any page from it

Soluzione scelta

This issue would normally be fixed with a clean reinstall that involved deleting the Firefox program folder.

  • (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
  • (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You can do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

You can find the full version of the current Firefox release (61.0.1) in all languages and all operating systems here:

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Applicazione

  • User Agent: Mozilla/5.0 (Linux; Android 8.0.0; SM-G955F Build/R16NW) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.91 Mobile Safari/537.36

Ulteriori informazioni

Pkshadow 1069 soluzioni 14836 risposte

What OS are you running, Linux or Android ?

Reinstall with Current Release Firefox 61.0.2 with a Full Version Installer

If that does not fix the issue the issue is in your Profile : Make a new one and test ...:

If is your Profile :

Do the above with Firefox closed. Work with Copies only, do not transfer the problem into the new Profile.

What's What in the Profile :

  • bookmarks and history: places.sqlite
  • bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
  • cookies.sqlite for the Cookies
  • formhistory.sqlite for saved autocomplete Form Data
  • logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager
  • if you only have key3.db then make sure to remove an existing key4.db
  • cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager
  • if you only have cert8.db then make sure to remove an existing cert9.db
  • persdict.dat for words you added to the spelling checker dictionary
  • permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
  • sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)

Please let us know if this solved your issue or if need further assistance.

What OS are you running, Linux or Android ? Reinstall with Current Release Firefox 61.0.2 with a Full Version Installer *https://www.mozilla.org/firefox/all/ If that does not fix the issue the issue is in your Profile : Make a new one and test ...: *https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles If is your Profile : *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox Do the above with Firefox closed. Work with Copies only, do not transfer the problem into the new Profile. '''''What's What in the Profile : ''''' *bookmarks and history: places.sqlite *bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder *cookies.sqlite for the Cookies *formhistory.sqlite for saved autocomplete Form Data *logins.json (passwords) and key4.db (58+) or key3.db (57 and older) (decryption key) for Passwords saved in the Password Manager *if you only have key3.db then make sure to remove an existing key4.db *cert9.db (58+) or cert8.db (57 and older) for (intermediate) certificates stored in the Certificate Manager *if you only have cert8.db then make sure to remove an existing cert9.db *persdict.dat for words you added to the spelling checker dictionary *permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences) *sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder) Please let us know if this solved your issue or if need further assistance.
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Utente che ha posto la domanda

My OS is Windows 10 64bit

I have deleted all files of firefox even profile

And I've been installing version 62.0.2 64bit

I've created new profile and still same problem

I don't know what should I do please help me

My OS is Windows 10 64bit I have deleted all files of firefox even profile And I've been installing version 62.0.2 64bit I've created new profile and still same problem I don't know what should I do please help me
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cor-el
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16605 soluzioni 149932 risposte

Soluzione scelta

This issue would normally be fixed with a clean reinstall that involved deleting the Firefox program folder.

  • (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
  • (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You can do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

You can find the full version of the current Firefox release (61.0.1) in all languages and all operating systems here:

This issue would normally be fixed with a clean reinstall that involved deleting the Firefox program folder. *(64-bit Firefox) "C:\Program Files\Mozilla Firefox\" *(32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\" An error message about XPCOM missing or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You can do a clean reinstall to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists. You can find the full version of the current Firefox release (61.0.1) in all languages and all operating systems here: *https://www.mozilla.org/en-US/firefox/all/ *https://www.mozilla.org/en-US/firefox/61.0.1/releasenotes/
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