[Springtime]

> The Quantum update was an update to the Desktop version of Firefox that happened in 2017. Mozilla did not remove access to any mobile add-ons at that time.

Legacy addon support was removed from Firefox for Android at that point, too. Wikipedia confirms that in 2017 v56 of the Android version was the last to support them[1][2] and according to the official Android release notes the update was also called Quantum.

You're apparently correct that it didn't technically remove support for WebExtension addons though the addons I used became incompatible with the switch (which unfortunately caused me to switch to another browser after a faithful period of sticking with Firefox), including most that never became re-compatible on either desktop or Android again, including the exceptional UnMHT and sadly Firefox since has lacked MHTML support to this day.

It seems the dropping of legacy addons similarly caused others in this thread to recollect FF for Android as having dropped addon support during that period, given the impact in functionality.

[1] https://en.wikipedia.org/wiki/Firefox_for_Android#Release_hi...

[2] https://www.mozilla.org/en-US/firefox/android/57.0/releaseno...