I try to not be too reactionary about that layoff news but it is something to keep an eye on. If you look at Statcounter's site, Firefox has a less than 1% market share for mobile devices and around 9% market share for desktops:
https://gs.statcounter.com/browser-market-share/mobile/worldwide
https://gs.statcounter.com/browser-market-share/desktop/worldwide
Keep in mind that's still 1% of billions and billions of users so by comparison it's not a promising reflection but it still involves a lot of active users (... and statcounter.com is by no means a definitive source, there are plenty of alternative sites that also use different metrics to compile their data). But the trend is worrisome considering desktop usage is relatively flat while mobile usage is still growing.
The saddest part is the Internet is already devolving back into a curated entity, as Chromium is becoming the next IE. It was only a few years ago when Microsoft dominated over the Internet using IE (with its Trident web engine and ActiveX) and we learned nothing from that time as we now cater to Blink-based web development over established common standards. Chromium itself may be open-source but it's still under a lot of Google oversight, the lesson we're ignoring it has never been a good idea to allow one corporation have so much control.