My guesses:

1. You have logged into a wrong account(like someone logged into his/her firefox account in your computer without your notice) 2. You have import old firefox data from somewhere or a html file. 3. you logged your firefox account in somewhere else (internet bar/ printing shop, etc), the history from that computer sync the footprints to your computer. your computer sync your history to that computer. 4. A virus is intrusively collecting your data. 5. your employer wife used your computer.

Accessible solutions

1. use firefox in safe mode by default 2. scan virus using some tools, like cleanMymac, .....so on 3. change your password to safer pattern 4. ask your wife.

Separate Security Issue: Update your Flash Player or remove it using these links; Uninstall Flash Player | Windows {web link} Uninstall Flash Player | Mac {web link}

Note: Windows users should download the ActiveX for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).

Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the ActiveX.

Flash Player Version 32.0.0.207

https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>

https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only> +++++++++++++++++++ See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

Lirui said

My guesses: 1. You have logged into a wrong account(like someone logged into his/her firefox account in your computer without your notice) 2. You have import old firefox data from somewhere or a html file. 3. you logged your firefox account in somewhere else (internet bar/ printing shop, etc), the history from that computer sync the footprints to your computer. your computer sync your history to that computer. 4. A virus is intrusively collecting your data. 5. your employer wife used your computer. Accessible solutions 1. use firefox in safe mode by default 2. scan virus using some tools, like cleanMymac, .....so on 3. change your password to safer pattern 4. ask your wife.

Very good advice...and #5) is correct! Employer wife logged into and left that iMac synced to my Firefox account...therefore new employees plugging away on my browser and slowing everything down. Was able to un-sync remotely- and problem solved. Thank you for your input! Much appreciated!