Is this on some websites, many, a few?

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

Эта проблема появляется не на определенных сайтах. Она появляется при любом действие , но с какой то периодичностью. За час такая проблема может появиться раза 4-5.

What adblocker or Security software are you using?

Adblock Plus. Точнее наверно будет сказать , что проблема появляется при любой активности но периодичностью.(4-5 раз в час )

HI, get back on topic in after this. You have errors in your Video Card Drivers : adapterDescription: NVIDIA GeForce GTX 750 Ti driverDate: 4-22-2018 driverVersion: 24.21.13.9731

u'blacklisted = Bad u'unavailable = Bad disabled=Bad u'blacklisted = Bad

u'Direct3D11 Compositing', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blacklisted', u'message': u'#BLOCKLIST_FEATURE_FAILURE_BUG_1457758', u'type': u'env'}], u'name': u'D3D11_COMPOSITING'}, {u'status': u'unavailable', u'description': u'Direct2D', u'log': [{u'status': u'unavailable', u'message': u'Direct2D requires Direct3D 11 compositing', u'type': u'default'}], u'name': u'DIRECT2D'}, {u'status': u'disabled', u'description': u'Direct3D11 hardware ANGLE', u'log': [{u'status': u'unavailable', u'message': u'D3D11 compositing is disabled', u'type': u'default'}, {u'status': u'disabled', u'message': u'D3D11 compositing is disabled', u'type': u'env'}], u'name': u'D3D11_HW_ANGLE'}, {u'status': u'blacklisted', u'description': u'GPU Process', u'log': [{u'status': u'available', u'type': u'default'}, {u'status': u'blacklisted', u'message': u'#BLOCKLIST_FEATURE_FAILURE_BUG_1457758', u'type': u'env'}], u'name': u'GPU_PROCESS'}

Please try : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData 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 61.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

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

Удалил браузер , так же удалил из папок , очистил с помощью Windows Disk Cleanup , и переустановил браузер обратно .Но проблема осталась (все закладки не удалялись и логины все остались , без использования резервной копии профиля )

Google Translate

I deleted the browser, also deleted it from the folders, cleaned it with Windows Disk Cleanup, and reinstalled the browser back. But the problem remained (all the bookmarks were not deleted and all the logins were left without using a backup profile)

Have you tried fixing your Errors in the Video Card ? Firefox likes good drivers. Forgot to add this to that last post : direct2DEnabledMessage: [u'blockedGfxCard']

Firefox does save your Profile as it is in a Separate Location. Just making sure and also educate with the info supplied.

Note you can get Support in your own language : https://mozilla-russia.org/

Я написал русской поддержке. Но мне никто не ответил в течении 10 дней .