Tor Browser uses the "extended support release" (ESR) of Firefox. ESR is designed mainly for organizations that need to deploy Firefox and have a focus on stability.
The reason I believe Tor Browser is based on the ESR build is that it is updated less often, allowing more time for adding privacy-enhancing features. This also means that such features break less often. Of course, security updates are pushed to the ESR branch as soon as they come out on "normal" Firefox, so there is no added security risk. As for the user-agent, I'm assuming Windows was chosen because that's what 90%+ of PC's are running. On Mon, 2016-03-14 at 13:04 +0000, [email protected] wrote: > User agent is Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 > Firefox/38.0 > > AIUI, NT 6.1 is Windows 7 and current Firefox version is 44.0. > > Also, does that mean that TBB used an "old" version of Firefox? -- poly @0xPoly https://darkdepths.net/pages/contact-keys.html
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