I keep being asked to update Firefox when I'm using the latest version.
I'm using Firefox Quantum, v. 64.0, on the latest Windows, but keep being told by Twitter, Facebook, and Yahoo, that I'm using an out-of-date version of Firefox.
Chosen solution
So resetting the useragent preferences worked?
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In your More System Details by your post your User Agent appears to be modified.
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0; WUID=d499ed992e822df31898e24fa6ddd052; WTB=23890) Gecko/20100101 Firefox/34.0
See https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
Modified
This is what I'm seeing:
See my above reply
To answer your question I advised that in the future you should include more details about your system and Firefox, specially if you are using add-ons like Ad Blockers (uBlock Origin, etc), it's possible they are spoofing referer headers and giving the wrong info just to protect your privacy, try to restart Firefox with all add-ons disabled, go to top right menu click, scroll to bottom, click Help and choose the option "Restart Firefox with add-ons disabled" to see if the problem disappear. What Firefox you are using,LTS, the default one or Firefox Dev Edition ? Good Luck, Lampadinha Miguel
Thanks for all your help, problem is fixed.
Chosen Solution
So resetting the useragent preferences worked?
Yes, it worked. Thanks for everything.