Hello and welcome to BC,
Probably some extension in FF caused your problems.
You should do an adware check.
ESET Online Scanner
§ Click here to download the installer for ESET Online Scanner and save it to your Desktop.
§ Disable all your antivirus and antimalware software - see how to do that here.
§ Right click on esetsmartinstaller_enu.exe and select Run as Administrator.
§ Select Enable detection of potentially unwanted applications.
§ Click Advanced Settings, then place a checkmark in the following:
o Remove found threats
o Scan archives
o Scan for potentially unsafe applications
o Enable Anti-Stealth technology
§ Click Start to begin scanning.
§ ESET Online Scanner will start downloading signatures and scan. Please be patient, as this scan can take quite some time.
§ When the scan is done, click List threats (only available if ESET Online Scanner found something).
§ Click Export, then save the file to your desktop.
§ Click Back, then Finish to exit ESET Online Scanner.
Please download AdwCleaner by Xplode onto your desktop.
§ Close all open programs and internet browsers.
§ Double click on adwcleaner.exe to run the tool.
§ In EULA window click I agree.
§ In Options uncheck Reset Winsock settings.
§ Click on Scan button.
§ When the scan has finished click on Cleaning button.
§ Your computer will be rebooted automatically. A text file will open after the restart.
§ Please post the contents of that logfile with your next reply.
§ You can find the logfile at C:\AdwCleaner[C1].txt as well.
Please download Junkware Removal Tool to your desktop.
§ Shut down your protection software now to avoid potential conflicts.
§ Run the tool by double-clicking it. If you are using Windows Vista, 7, 8 or 10; instead of double-clicking, right-mouse click JRT.exe and select "Run as Administrator".
§ The tool will open and start scanning your system.
§ Please be patient as this can take a while to complete depending on your system's specifications.
§ On completion, a log (JRT.txt) is saved to your desktop and will automatically open.
§ Post the contents of JRT.txt into your next message.