Firefox 29 is the first version of Firefox desktop that used Firefox Accounts to sign in to Sync [1]. Firefox 29 was released on April 29, 2014.
In the nearly 3.5 years since Firefox 29 was released, Firefox has aged by 26 full releases. Perhaps surprisingly, FxA still officially maintains and supports sign in to Firefox 29. I just tried to make sure I wasn't going to have to eat those words. It works. Yay us. The thing is, as FxA adds more features that are only supported on Fx >= version N, maintaining support for these old browsers is becoming increasingly complex, time consuming, and expensive. Our full functional test suite now takes an hour to run, many of the tests are for browsers which have been unsupported by Mozilla for some time. I propose we purposely lose some of the extra baggage by officially dropping support for Firefox <= current ESR - 1. Why current ESR - 1? Well, Mozilla officially supports Firefox back to ESR. There are a bunch of companies that lag behind even that, and since we are a nice group that doesn't like to anger folks, we'll support 2 full ESRs. Current ESR is based on Firefox 52. The previous ESR was based on Firefox 45. We'd officially support down to Firefox 45. For users that try to sign in to FxA on these old browsers, we could show some nice screen that says something along the lines of "Hey, sorry to do this to you, but your browser is really really behind the times. For your own safety, here's a link the latest and greatest." Thoughts? Shane [1] - https://www.mozilla.org/en-US/firefox/29.0/releasenotes/
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