http://gyazo.com/561c5943d211174a8c8f3839b151189a.png
I get a stupidly annoying alert pop-up every time firefox can not connect to a webpage. If this webpage is opened in many tabs I have tens of these alerts open and have to mash 'ok' to rid myself of them.
Example: http://gyazo.com/561c5943d211174a8c8f3839b151189a.png
This happened
Every time Firefox opened
== Perhaps last update
Όλες οι απαντήσεις (1)
Is the pref browser.xul.error_pages.enabled set to true on the about:config page?
To open the about:config page, type about:config in the location (address) bar and press the Enter key, just like you type the url of a website to open a website. If you see a warning then you can confirm that you want to access that page. --- 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
Another possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, maybe after detecting changes (update) to the Firefox program. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox. See Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls