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Thanks for replying. I was seeing the popup message every time I access email. I just found an older message saying to go to Firefox "Tools" menu - AddOns and delete the Xfinity toolbar. I didn't have an Xfinity toolbar to my knowledge but I did that and got the option "Remove" and did that. Hopefully problem now solved.
I moved your question from the Macintosh forum to the Web Browsers forum. Are you using a Mac? It sounds like it isn't a relevant part of the problem.
See this thread about problem with Firefox and the Xfinity Toolbar:
I'm with WTP, don't use it, it's not necessary for anything. Safari and Firefox both provide built in web search, you can bookmark the Comcast homepage, if you wish to use it, but realize that you are in no way required to ever go there. OS X has a great built in email client in Mac Mail so you don't even have that reason to go to the website.
I'm a bit late to the "party" so to speak, but I have had no problems with the Xfinity toolbar on Windows 7 SP1 x64 with IE11. It loads really fast, it's convenient, and I never get cut-off when viewing a live show or movie. I think it is well worth having it, but that's my opinion. IE11 has so many page load errors that has got nothing to do with the toolbar. So, I recommend using the toolbar.
I just found this recent post from comcast user: http://forums.comcast.com/t5/Web-Browsers/Web-page
Hi Anon 348144 :
Here's a link to some You tube videos on installing Xfinity on IE11. Also, when I did a search, there seems to be a conflict with the Norton Security Suite. Anyhow, if you'd like to try it, maybe one of these videos will help. Again, I personally like it and have had it since 2012. Even when I upgraded from IE9 to IE11, I didn't lose it. I know the majority feel toolbars are junk and in many ways, they are correct. However, I've never had a problem with the Xfinity toolbar and it is really handy if you can get it to instal. So, here's the link I found and I hope it helps. It's also located in my program files(x86), so I don't know why it's telling you, you need a 64 version for IE11. If worse comes to worse, you could use CHROME and they have an addon for the browser for the Xfinity toolbar. Good luck.
I was told by an Xfinity 3rd tier tech don't use the toolbar. He also said most toolbars cause more issues then they are worth. Xfinity tool bar is particularly worthless in my view. You can get the same basic features using the link buttons on Xfinity Homepage.