Less than 2.6% of browser users (with telemetry enabled) are using Firefox. Should the web drop support for Firefox? Seems sensible. (I would hope not)
It'd be ~0.1% of Firefox users that use 32-bit Linux, extrapolating from e2le's statistics, not 2.6%. Have to draw the line at some point if an old platform is becoming increasingly difficult to maintain - websites today aren't generally still expected to work in IE6.
Firefox shouldn't need special support by the web, the same relationship can't be said of architecture specific binaries.