after setting Firefox as WIn 10 home default browser, I cannot launch Firefox,
I launch Firefox the mouse pointer spins and then I get nothing.
Tried to un/reinstall, when reinstalling. When reinstalling it says Firefox is running, but Task Manager doesn't show it, and I cannot see the browser interface anywhere.
Prior to this problem I notice Firefox was launching a tiny window in the upper left hand top of my screen. Why do I think the browser Edge is cutting out Firefox?
I also lost bookmarks, I do have an old Firefox data Folder, from a refresh when Firefox was running extremely slow on Win 10.
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This sounds like several different problems. First, let's get Firefox to open.
Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;
- Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
- Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see
Configure firewalls so that Firefox can access the Internet. {web link}
https://support.mozilla.org/en-US/kb/changes-toolbars-and-window-sizes-are-not-saved You may have corrupt xulstore.json or Localstore.rdf file.
Close Firefox. Open your file browser to this hidden location:
- Mac: *~/Library/Application Support/Firefox/Profiles
- Linux: *~/.mozilla/firefox/Profiles
- Windows: %AppData%\Mozilla\Firefox\Profiles
- *C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles
- Windows XP: C:\Documents and Settings\<user>\Application Data
\Mozilla\Firefox\Profiles\
Search for the above files. Then rename or delete them. Restart Firefox.
Try to disable accessibility services in Firefox.
- Options/Preferences -> Privacy & Security -> Prevent accessibility services from accessing your browser
- https://support.mozilla.org/en-US/kb/accessibility-services
- http://techdows.com/2017/08/firefox-57-prevent-accessibility-services-accessing-browser.html
You can check if there are JSON backups available.
- Bookmarks -> Show All Bookmarks -> Import & Backup -> Restore
If that didn't work then try to recover the bookmarks from the "Old Firefox Data" folder on the desktop. You need the places.sqlite file and possibly the bookmarkbackups folder with the JSON backups.
You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.
- Help -> Troubleshooting Information -> Profile Directory:
Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder - http://kb.mozillazine.org/Profile_folder_-_Firefox
You can copy files like these with Firefox closed to the current profile folder to recover specific data. Note that you should be cautious with copying SQLite database files if you previously had problems.
- 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)