macOS Not able to use Xcode with Firefox and problems in Safari

Hi! Yesterday I downloaded Xcode and today I downloaded Firefox, I want to remove Private Browsing and View all History from the Firefox menu but when I open the ff resources i can't find anything from Xcode why does this happen?

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On safari, when I opened mainmenu.nib in resources i could see private browsing and I deleted it, but I couldn't see the ''View all History'' on the History submenu so I could not delete it, what happens is, my kids usually go on private browsing (not anymore since I deleted it) but still when you click on 'View all History' you can delete the sites you visited and I don't want them to do that...

any help?? thanks

zabbadu said:

you might check the about:config in firefox. there may be something in there.

just enter about:config in the address bar, search for the configuration you're looking to alter & try changing settings [or delete them]..

Click to expand...

nothing found! thanks for your answer...