https://twitter.com/BrendanEich/status/1217512049716035584/p...
https://twitter.com/BrendanEich/status/1217512049716035584/p...
If you look at their own statistics [1], you will notice that (worldwide) usage started declining after the introduction of Quantum (November 2017), and dropped substantially after the April 2019 addons outage.
This would suggest, IMHO, that Firefox loses market share when beloved features - customization, addons - stop working or got worse.
This is unsurprising to anyone who has been using Firefox for a long time: the primary differentiation factor of Firefox has always been customization. Messing with that would always be a risky proposition. Nuking the whole ecosystem entirely and starting over in the space of a few of months was simply idiotic. Disabling everyone's addon's because of an admin screw up was just the icing on the fucking cake.