A dialog-box "Alert" comes up when I start a new tab; it never did this before.
When starting a new tab, a dialog-box "Alert" comes up and has this in it, "The URL is not valid and cannot be loaded." I'm using Firefox 3.6.10. That this dialog-box is coming up is a new thing. Just this week switched from DSL to Comcast-cable. I'd like to have Google show up as the default when starting a new tab but can not figure out how to do that.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the Safe mode start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
All is ok; it was suggested to disable all "add-ons" and selectively enable them one-by-one; that fixed the problem. Thanks.