Firefox 57 breaks legacy extensions blah blah. This page documents my personal experience upgrading to it.
2017-11-23: I'm staying with 52 ESR for now. (despite the noticeable slowness compared to 56 even)
2017-12-13: Downloaded 59 nightly, using it in a parallel profile
2018-01-21: Had an rm -rf accident and deleted my main profile - luckily i recovered all the important stuff, but decided that this is a good excuse to move to the nightly profile as the main one
Here's a spreadsheet.