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Recieve the message "Navigation to the webpage was cancelled" after typing about:config and hitting enter?

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Recently I over cleaned my computer with "Auslogics duplicate file finder program" and have since had problems activating some programs and accessing some websites; for example could not load Adobe Reader PDF files. Then I downloaded Foxit PDF Reader and then I was unfortunately stuck with Ask homepage. I tried to access "about: config" to disable Ask homepage but could not access the about config webpage. I have since reinstalled my homepage, but I would like to know how to access about:config webpage if I need to at some time in the future.

Recently I over cleaned my computer with "Auslogics duplicate file finder program" and have since had problems activating some programs and accessing some websites; for example could not load Adobe Reader PDF files. Then I downloaded Foxit PDF Reader and then I was unfortunately stuck with Ask homepage. I tried to access "about: config" to disable Ask homepage but could not access the about config webpage. I have since reinstalled my homepage, but I would like to know how to access about:config webpage if I need to at some time in the future.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).