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Pop up says "URL is not valid and cannot be loaded" Page continues to load normally however.

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braveemc
braveemc
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This pop-up happens on several websites, yet the page continues to load properly and function normally. However, I must keep clearing the alert box for it to do so.

This pop-up happens on several websites, yet the page continues to load properly and function normally. However, I must keep clearing the alert box for it to do so.

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cor-el
cor-el
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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")