This problem started for me around 4ish months ago, but I couldn't tell you the version number I was on at the time. I'm having the exact same issue on two different phy… (read more)
This problem started for me around 4ish months ago, but I couldn't tell you the version number I was on at the time. I'm having the exact same issue on two different physical computers both running Windows 7 Pro x64, while I do not have this issue on my work computer running Windows 10 Pro x64.
After a period of time, sometimes 6-8 hours, sometimes 48 hours, I am no longer given any context menu's when I right-click in FireFox, either on a webpage or on the toolbar areas. This typically happens when leaving FireFox open and idle over night, then I see the problem in the morning, or some mornings it works fine and continues to throughout the day, but then stops the following day. So, for example, I am unable to Pin or Unpin tabs when this happens, nor can I right-click anywhere. Also, when I click on the Menu or Bookmarks button, nothing pops down. The button changes colors to a darker shade like it is de-pressed but the menu does not appear. This happens in drop-down menu's on websites as well - they do not appear. I am able to use the up and down arrows, or letter keys, to move around them but the drop-down is gone completely.
This is all fixed if I close FireFox and re-open it. Seemingly a timer is reset and everything works again for a while.
What I've done:
I started with simple things like unpinning my tabs, closing tabs and removing extensions but non of that worked. I then backed up and deleted my entire Firefox profile under AppData - Local but it started happening on my new profile also. Earlier this week I completely uninstalled FireFox and the update service, and deleted everything Mozilla from all three AppData folders as well as ProgramData. I rebooted and then re-installed FireFox using Ninite. I did not import any data, pin any tabs, install any add-ons or save any passwords. I was trying to be as vanilla as possible, but the problem was happening again the next morning. Yesterday I started FireFox in Safe Mode and am having the same problem running in Safe Mode.
This effort so far has been concentrated on one of my two machines experiencing this problem, as I was hoping to solve it on one and then apply the solution to the other, but I am at a loss. I can't imagine that additional Windows programs would cause this but there are a few overlapping programs between the two.
I have Microsoft Security Essentials and MalwareBytes Premium installed on this primary machine having the issues, whereas I do not have MalwareBytes installed on the other machine also having this issue. I thought the Web Protection may be interfering but I don't believe so now.
One other similarity is that both computers are non-domain and the primary account used on both is a non-admin account purposely (I try not to run as admin unless absolutely necessary, for obvious reasons). I'm wondering if possibly not running as an admin is causing an issue somehow? I will try temporarily making myself an admin tonight and leave FireFox in Safe Mode idle again to see if anything has changed.
Other than that, would you have any ideas or things I may be able to try? I'm open to anything at this point, I just want this fixed! I don't want to move to Chrome. :(