Concern about WebExtensions exclusive strategy from add-on authors and users

With Firefox Firefox 54.0.1 I have 69 active extensions.

The extensions in which I’m most interested – I’ll not use Firefox 57 without these, or suitable alternatives:

Side notes

From Firefox Sync failing to sync at least ten exensions - #2 by grahamperrin

… Firefox Nightly 57.0a1 … (some of the legacy extensions are forcibly disabled): 56 active extensions … seems impossible to install Containers, Min Vid or Snooze Tabs. …

If we assume that those three Firefox Text Pilot experiments will become usable with Firefox 57: let’s say, 59 active extensions.

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