[dsvf]

Some of this is intentional on websites from Google. Google sheets has a very very annoying bug where if you want to multiply two values in a cell formula and press the asterisk key, the cursor jumps to the left of the asterisk. You then have to manually place the cursor to the right of the asterisk (since pushing the right arrow key may instead jump to the next cell to the right), breaking any typing flow whatsoever. However, if you fake your Firefox user agent to chrome (but change nothing else), the bug disappears.

I recall reading a post here on HN that Google has been found from time to time to intentionally cripple the FF user agent, which in turn led me to "discover" the sheets bug fix.

This does not change much about what you wrote, but it's at least something to do against malicious incompatibility