I mean sure, but realistically speaking, how can we afford to continue supporting Firefox? I can't make a plea to the CTO of "Please let us keep investing money in compatibility because it may have a minor impact on the open web."
Firefox is in a downward trajectory for marketshare and mindshare. I would love to hear a realistic solution to this problem. Maybe switching to WebKit?
Given how many discussions I had in the past about people insisting to support legacy, unsupported browsers I'm surprised "5% of our users use it" isn't enough to convince almost everyone to support it.
If you mean Internet Explorer, it's because the deprecation of that is starting now because Edge supports IE mode for legacy apps and is otherwise Chromium.
Firefox is in a downward trajectory for marketshare and mindshare. I would love to hear a realistic solution to this problem. Maybe switching to WebKit?