I have been having problems with Yahoo mail since the last two Firefox updates - what can I do or is there a problem with Yahoo?
Immediately after the FF update a few months ago, Yahoo! shows me as logged out and the browser will not let me sign in. This is not a case of Yahoo moving their server. I know this because Yahoo still works properly with Safari, Chrome and Explorer. It only does this with FF. The most recent update today did not fix the problem.
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Today your got Security fix for : https://www.theinquirer.net/inquirer/news/3023893/opera-mozilla-vivaldi-and-more-rush-to-patch-spectre-and-meltdown-security-holes
uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :
- https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
- https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
Reinstall with Current Release Firefox 57.0.4 with a Full Version Installer
Please let us know if this solved your issue or if need further assistance.