Well done for looking at other questions before posting.

One thing we should try to decide is are you experiencing hangs or crashes ?

• see firefox hangs
• firefox crashes

Have you also seen

• unable to download or save files
• firefox crashes when trying to download a file

You can also try to delete the mimeTypes.rdf file in the Firefox Profile Folder.

• http://kb.mozillazine.org/mimeTypes.rdf
• http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

I made a new profile, deleted mimetipes.rdf nothing work for me. Somebody have ideas to solve such a problem? Thank you. PS Sometimes Firefox hangs but most of the time it crashes.

If you are getting crashes please

1. read the article already linked above firefox crashes
2. use about:crashes as explained in that article, to find the submitted CrashID s
3. post two or three of the recent Crash ID s in your next message (by copying and pasting them. )

bp-5d52e578-0069-4610-8efc-10425212021919.02.201223:34
bp-f308eb2b-cbfe-40fd-81b5-d192a212021919.02.201223:08
bp-6a538dc8-90ca-4b55-a662-5b788212021919.02.201220:37
bp-bff2939f-ac32-49d4-853c-622bf212021919.02.201219:44
bp-0841e4b8-c464-4c84-91fa-3c9a6212021919.02.201219:25
bp-300aa7b7-b3da-4a20-85fb-9203a212021919.02.201218:53
bp-4db23c0e-d90c-4701-b0a2-cbb19212021919.02.201218:38
bp-28f39d21-e4a1-4a37-8b20-d3a62212021919.02.201218:34

No doubt cor-el will come up with suggestions. I will list the crash report details incase they help anyone. The crash occurs when a Windows related component is in use. Have you ensured you have no unnecessary background tasks running, and that no Firefox plugins are running.

No reason to expect it to be directly related, but a previous crash with the same signature occurred when bookmarks were used, and the reported solution in that instance was:

I found out that an option in Microsoft File Explorer caused the crash.
To solve this:
- Go to "Organize"
- Choose "Folder and search options"
- uncheck "Automatically expand to current folder"

 Now Firefox won't crash again!

Your reports for CrashID s all have the same signature

• related bug650664 - crash if I backup my bookmarks ....
• Signature: TV_GetItemRect(_TREE*, _TREEITEM*, tagRECT*, unsigned int)
  • 5d52e578-0069-4610-8efc-104252120219
  • f308eb2b-cbfe-40fd-81b5-d192a2120219
  • 6a538dc8-90ca-4b55-a662-5b7882120219
  • bff2939f-ac32-49d4-853c-622bf2120219
  • 0841e4b8-c464-4c84-91fa-3c9a62120219
  • 300aa7b7-b3da-4a20-85fb-9203a2120219
  • 4db23c0e-d90c-4701-b0a2-cbb192120219
  • 28f39d21-e4a1-4a37-8b20-d3a622120219

You can try the solution in comment 6 of that bug report.

• https://bugzilla.mozilla.org/show_bug.cgi?id=650664#c6

Thank you both. You made my day!

Glad we helped, I guess something worked. Thanks for posting back.

I had the same issue ; here is how i went through  : Delete profile\content-prefs.sqlite

=> Browse button tried to open a unstable samba share and firefox crash when trying to browse on it

131.mozilla

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