How would one check the status of website saved as bookmarks, without clicking and loading each entry individually? For reference, I use Mozilla Firefox.
This seems to be a pretty good extension for Firefox that does what you want. https://addons.mozilla.org/en-US/firefox/addon/bookmarks-checker/
It adds a small icon between the URL field and the search field in firefox. When you click it you can initiate a scan of all your bookmarks.
Description from addons.mozilla