Hello,

• with closed firefox, hold down the shift key while starting Firefox and you are in firefox safe mode.
• with open firefox, click the 3-bar menu (on your right up), then help (the question-mark, and then choose the "Restart with Add-ons Disabled..." and you are in firefox safe mode.

but Firefox Safe Mode is mode that can be used to troubleshoot and fix problems, what is your problem and firefox works better in safe mode ?

see also : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#firefox:win7:fx49

thank you

Security Issue: Update your Flash Player Note: Windows users should download the active_x 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 active_x.

Flash Player Version: 23.0.0.185 Flash Player (Linux) Version 11.2.202.637

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

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.

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration