McMom said

Since the update, my Swagbutton addon disappeared and when I click the link to get it back (http://www.swagbucks.com/extension), it goes to a blank page. Is there a problem with the button or this site? I've used it for a number of months.

Hello McMom,

The last bracket has become part of the URL here, that's why it doesn't take you to this page :

http://www.swagbucks.com/extension

I hope you know that this is not an extension from the official addons.mozilla.org page and might not be accepted  ?

See this thread : https://www.reddit.com/r/SwagBucks/comments/85v7l0/swagbutton_on_firefox/

The url both you and I gave is correct, and has worked before, but when I click to install... that's when the problem occurs. It takes me to a blank page.

I also notice that when I click the + sign to add a new tab, then I click on one of the site icons at the Google page, it won't go anywhere. It's blank. In fact, the new tab url is about:blank. It should be Google.