No Firefox I don't actually want you to stick them in an account forever. The weight of my unfinished projects is crushing.
Honestly, and as someone who uses >1 browser, you are an outlier.
For the vast majority, you click the "beachball" or the "red fox" and that's how you internet.
And among those that use >1 browser, I don't want bookmarks or other stuff interoped/shared. I'm specifically using seperate browsers to keep things seperate.
I don't know how well Firefox Pocket works, but Google seems to have no issue keeping bookmarks between phone and desktops synced just fine.
But, I use Firefox everywhere except for one Android table that because of Google stupidity/cupidity/rapaciousness doesn't have room to install Firefox even though it has a nearly empty 128 GB SD card.