@57 It has to be an add-on. Now after starting FF in safe mode (add-ons disabled) I see the gear and can "like" posts. I don't have that many add-ons, so maybe I should disable them all and then enable them one at a time to see which is the culprit. Last week I found I could not sign into TD EasyWeb with FF. After a lot of troubleshooting I found it was because I had enabled an add-on that I don't remember disabling, something that enables right click copy on sites that don't allow it. Made no sense, but I got rid of it and I could sign in.
Okay, I had 8 add-ons. I disabled them all and FF showed the "gear" here. I then enabled 3, one at a time, that I knew I really needed and it still worked. Not sure how or why I got the others, but they seem unrelated to here. If I find I need one of them I'll enable it as required, checking back here. Lesson learned, don't just add add-ons because they seem cool and may be useful.
Full disclosure, the Firefox add-ons I had are listed below. I disabled them all, then enabled those marked "@".
Adblock Plus @ Anti-Paywall Behind The Overlay Revival @ convert2mp3.net Online Video Converter DuckDuckGo Privacy Essentials F.B Purity - Cleans up Facebook (WX) @ Facebook Container
If I find I need one of the disabled ones, I can always put it back and see. Strange that disabling each one at a time didn't fix the problem, but maybe there was interaction between them. photobucket embed fix