I love firefox except for a fairly recent feature adopted by chrome, which is the ability to update usb device firmware through a web browser via the Web Serial API. I do a lot of ESP32 stuff and it's so much nicer to be able to go to a webpage and just install the firmware directly rather than having to actually configure and compile it from scratch in vscode/platformio.

For instance, if you want to install WLED, just go to https://install.wled.me, select the version, select the usb port your device is connected to and "install." Bam, done.

Firefox team views it as insecure: https://github.com/mozilla/standards-positions/issues/336