The Tab Mix plus developer is working on a web extensions version, patience it will probably get done.
Classic Theme Restorer could never work on 57, read the developers explanation for why it's not possible. I bit the bullet during the beta and abandoned it and can manage perfectly now without it.
Updated today to FF57 to find my 'Context Search 0.6.4' extension by Ben Basson no longer compatible with FF57.
I did find a suitable replace in 'Context Search 3.52' by Olivier De Broqueville
https://addons.mozilla.org/en-US/fir...search/?src=ss
Honestly, the extensions problem depends entirely of the developers, like I have read in a thread in MDL, they had a whole year to upgrade to web-extensions api, if they haven't... well, that's laziness.
I've heard there is an extension that allows you to install Chrome or Opera's extensions from their store, probably worths a try.
I had updated to 57. Speeddial gone. Now all speed dial addons ask for permission to "access your data for all websites" and more. An example is below.
Why they need permission to access all data on websites?
Is it safe?
Those permissions make the extension able to retrieve custom icons for websites, keep a list of your history so you can access it through their newtab page replacement, retrieve your bookmarks so you can access them from the speed dial page, being able to keep track of which tabs you close so you can restore them later, paste what you got on the clipboard, check what theme you use and adapt to it...
I woudn't worry too much about it, after all, is the same extension that is listed for Chrome, and even there it asks for the same exact permissions...
Till you decide or verify if your plugins are compatible/upgraded you can use Firefox ESR,
it has security support without feature upgrades:
Firefox Extended Support Release for Your Organization, Business, Enterprise - Overview — Mozilla
I upgraded FF to 57 yesterday. Didn't break anything for me, but I have very few add-ons. I use both Edge and FF, just depending.
I don't like or will never install Chrome again. I did it once and it caused DPC Latency problems and dropouts in my recording studio apps. I had a major issue, at the time (Win 7) of getting rid of Google's auto updater. Even removing it with Revo Uninstaller that also scans and removes registry entries didn't fully do it. I had to manually edit the registry and remove close to 100 Google entries to finally get rid of it.
I'm disappointed in the number of new compatible extensions that FF 57 supports. There is only 3 pages (Maybe 25) that will work. The only good news is that Adblocker, Ghostery and few others are compatible.
Mozilla needs to provide a list of extensions that are being worked on. That would help those on the fence to upgrade or not or yet look to another browser.
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