Is Grammarly recommended -and if not, accepted and reasonably safe, for Firefox?
See above.
See above.
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Hi
I use Grammerly myself and do not have a problem with it.
You can download it for Firefox from:
https://addons.mozilla.org/en-GB/firefox/addon/grammarly-1/?src=search
I also use it.
This article might help: Tips for assessing the safety of an extension.