hello richard, please try to reset firefox and see if this can address the issue...

After clicking Allow or Allow for Session or Block as many times as required to clear all the dialogs, try reloading the page to re-request the content from those external sites. You can use Ctrl+Shift+r to bypass any incomplete cached files and request everything fresh from the server. Does that work?

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

Also check the exceptions.

• Firefox/Tools > Options > Privacy > Cookies: "Exceptions"

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page.

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make a note of those passwords and bookmarks.

You can't recover from this 'forget' unless you have a backup of the affected files.

It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.

Thanks for the many answes. I followed the description off cor-el and solved my problem.