Why do I get an "untrusted connection" message when trying to access Google?

This seems to happen a few times a week. Usually, I'm trying to do a search, and then no Google sites will work - mail, maps, whatever. I have a Mac, my time zone is correct, and I never add an exception because I don't understand why Google of all sites would have a faulty certificate, and it usually begins working again after several minutes. Usually, the problem is that the certificate belongs to another site. Today, it said the security certificate belonged to Adver.tv or something similar. What is going on? This almost never happens with other sites - just Google. The one exception I can recall occurred when I was attempting to file my taxes online using TaxAct, which seemed even more suspicious.

That sounds very suspicious!
Could you investigate your '''extensions''' and disable or remove ALL nonessential or unrecognized extensions on the Add-ons page. Either:
* Command+Shift+a
* "3-bar" menu button (or Tools menu) > Add-ons
In the left column, click Extensions. Then, if in doubt, disable.
Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Does that make any difference? Perhaps it will take time to know.
Also, please check your '''connection settings'''. Open the Preferences dialog to the Advanced panel here:
"3-bar" menu button (or Firefox menu) > Preferences > Advanced > Network mini-tab > "Settings" button
On Windows, this defaults to "Use system proxy settings" -- I don't know what is normal on a Mac, but it may be similar to Windows. You also could try "No proxy" and see whether that makes any difference.

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