403 forbidden message when trying to go to Thunderbird support page
When selecting the Help Contents from the Thunderbird Help drop down list, Firefox will not take me to the Thunderbird Support page. The following message is displayed on the the empty tab:
You don't have permission to access /en-US/thunderbird/20130328110546/ on this server.
The tab name is 403 Forbidden.
Clearing the cache did not help.
I could get to the support page for Thunderbird a week ago, but the search function was not available. A message popped up that said to try again in a few minutes. Clearing the cache did not help.
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 (Show All History or History sidebar) or via the aboutermissions 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 that '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.
Re: 403 forbidden message when trying to go to Thunderbird support page
The answer to your first question is, yes. I cleared the cache and lost all Firefox tabs that were currently open. I am clicking on a link (Help Contents) within a Mozilla program (Tbird), to take me to that page in another Mozilla program (Firefox) and I get a 403 Forbidden message.
I believe that the problem WAS on Mozilla's end. I say WAS, because this problem is no longer present for reasons that I cannot explain. I believe that there have been issues with Thunderbird lately.