That is simply a scam. Don't call that number. The people on the other end of that number are scammers who will try to get your bank info

Download and run Malwarebytes (www.malwarebytes.com). Then, install uBlock Origin.

Try using Ctrl+w to close that tab. Sometimes you have to remove pop-up messages before Ctrl+w will work. Sometimes there is a checkbox at the lower right (to the left of the OK button) to stop the site from showing more dialogs. That's a feature you can use to stop sites from continuously bothering you with dialogs so you can close them.

Thank you both for the answer and time. But it didnt solve the problem. No checkbox, and the Ctrl+ didnt work. I ran Malwarebyte, SuperAntispyare, a rootkit von Spybot Search and Destroy. i have all features of Firefox UBlock origin, Adblockplus and Ghostery on. all tabs are blocked. And it seems to be implanted in my Firefox account because deinstall and reinstall doesn't work. Thank you for you help!

The problem is solved after a third run of SuperAntispyware. thank you!

Seem proficient with cleaners. Bought this and runs great. https://www.bleepingcomputer.com/download/roguekiller/ Will find things in Ram, which is good. Do Google everything it finds or go to there forum for help. Try Eset for online scan but watch for false/positives.

• https://www.eset.com/us/home/online-scanner/

Profile :

• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Work on it while not running.

• 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

Can make backups so do can get things back :

• 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

Do not transfer the virus or what ever 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)

Glad. Great...

Removed post (problem solved while I was typing it .... )