'''New Tab Override''' extensions also doesn't helps, because of restriction for extensions to use full javascript. It gives the error: '''Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”).''' So these days mozilla crop. actually totally blocked the ability for users to use their own files as their own new tab, and blocked for extensions to access local files or full-functional javascript on their own pages, which is not just ridiculous but malicious. So how can i use my local file with full-functional javascript as new tab?