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Rated 5 out of 5 stars
Incredibly useful. Can't believe this isn't part of Stylish already.
Is there a way to limit the number of backups kept, besides turning them off entirely?
Yes, there is a way...
If you're familiar with 'about:config', you can go there and set the preference 'extensions.stylishsync.bakage'. The default is 14 (days).