Updating foxfire plugins travel dating websites
3- wikipedia (https://en.wikipedia.org/wiki/Plug-in_(computing)) says plugin are being deprecated.
4-I have read in another website that plugins are larger than add-ons and it consist add-on concept.
General rule of thumb: When you're talking about a web browser, a plugin talks about a NPAPI or similar plugin, which is specific to the page.
So you can stay current with just one Firefox update. Firefox now supports more features that used to require plugins, so you can browse with fewer crashes and interruptions.