Incredibly niche and may be a Mac-only rec, but I've been really wanting to use Firefox containers to minimize tracking, but something I keep coming up against is that I always use cmd+t to open a new tab, but Firefox doesn't have a way of setting a new tab to open in the same container you're currently in (and having to click multiple things to do something as simple as opening a new tab is ridiculous). Solution: First, install the Easy Container Shortcuts Firefox extension and leave everything as is. Next, install Karabiner (it maps keys on your keyboard) and create a custom modification that maps cmd+t to cmd+opt+t (here’s the json!).
puts your cursor directly in your address bar. for a guy who's tabbing in and out of things at mach speed it's a gamechanger. honorable mention - cmd+t (new tab), its lover
...HTML, CSS, Java and Webhosting I guess. It's not that complicated and you're actually flexible and free unlike with service providers who promise flexibility and freedom but then sell your data to advertisers and box you in their environment when you want to change something.