I'm a longtime Firefox user myself and I will continue to use it in the future, despite any minor incompatibilities or concerns about default telemetry, because it remains the only major competitor to Google's monopoly. Basically every other browser, even privacy focused ones, is based on Chromium (which is developed by Google). However, in terms of market share, Firefox is in real trouble and continues to decline, which is the joke I was making in my reply to you. It's only on top if we turn the market share graph upside down.