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Re:Firefox 57.0 Released by Merad on Tuesday November 14, 2017 @02:04PM (#15698111)
So, dumb question (maybe), but how do you get tree style tabs to install? I'm running FF 57 but that page says it's incompatible because I'm running FF 51. I checked and the user agent string being sent is:

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:51.0) Gecko/20170125 Firefox/51.0;

Re:Firefox 57.0 Released by SAI_Peregrinus on Tuesday November 14, 2017 @02:37PM (#15698392)
Stop spoofing your user agent string, install it, then resume spoofing. It should be

    Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
by default for Firefox 57 on Windows 7 64-bit
Re:Firefox 57.0 Released by Merad on Tuesday November 14, 2017 @03:47PM (#15698952)
I have never (to my knowledge) done anything to change the user agent. I dug around in about:config and discovered that general.useragent.override somehow got set.

Edit: Something is resetting that override every time the browser starts. Dunno what, the only addons I run are uBlock and RES (and now TST).

Edit 2: It was being set in user.js. No idea how it got there...

Re:Firefox 57.0 Released by milofeynman on Tuesday November 14, 2017 @03:54PM (#15699007)
Do you have

  privacy.resistFingerprinting = true
set?
Re:Firefox 57.0 Released by Merad on Tuesday November 14, 2017 @04:03PM (#15699086)
Nope, I discovered that it was being done in user.js. No clue how that happened...
Re:Firefox 57.0 Released by milofeynman on Tuesday November 14, 2017 @03:42PM (#15698913)
I believe

  privacy.resistFingerprinting = true
spoofs user agent. Does anyone know if there is an addon or to whitelist which pages you don't want it spoofed on?
Re:Firefox 57.0 Released by StillBored on Tuesday November 14, 2017 @04:38PM (#15699410)
Click "See all versions" and scroll down until you find one that is compatible.