There used to be a feature whereby a bookmarked page could be flagged for offline use. Then when you visit that page, it instantly renders the page regardless of whether you are online. Was that removed?
There is a «File→Work Offline» tickbox, but that’s apparently something different because it gives no way to specify which pages should function offline.
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Use SingleFile for similar functionality.
Dont know if they removed it or not, have been using google chrome mostly before switching to Firefox.