TypeScript Migration completed, along with fixing issues with focus logic. Works on Chrome and Firefox

Our code base is now using TypeScript and code is working with Firefox. I also fixed issues with our focus logic after figuring out that we are checking for specific URLs like twitter.com/home or linkedin.com/feed to focus/unfocus, but I recognized that instead of doing a hard check, we just need to see if home and feed are in the URL instead, because there are instances in which the URL won't be only https://www.linkedin.com/feed/ or https://www.twitter.com/home