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A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.
The Firefox "Page Info" window gives you details about the page you're on. You can also use it to change permissions for the website.
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Since the release of Firefox version 52 in March 2017, NPAPI plugins no longer load, except for Adobe Flash. Learn more about this change.