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No-Cache No-Store for Selected Hosts

Firefox 79+ no longer revalidates cached CSS files against the server to pick up updates on a standard reload (F5 or Ctrl+r/Command+r). Use this extension to disabling CSS caching so you don't need to use Ctrl+F5 or Ctrl+Shift+r/Command+Shift+r each time.

Permissions

It would be more convenient if you didn't need to grant permission on a site-by-site basis, but I hope this design makes it easier to trust the extension, since it can only intercept responses from servers that you've allowed yourself.

Install
The extension integrates into the Page Actions area of the Address Bar. To hide the button, right-click it and choose Remove from Address Bar. It will be available on the When you click the button in the Page Actions popup, the extension launches the Options page to update the host permissions. When you click Update Host Permissions, Firefox will prompt for all the new host names. Probably you only need to apply this to CSS files, but if you need to apply it to JavaScript or HTML files as well, you can select those on the Options page.