This is one of those things that's sorely missing for me. Firefox has keyboard shortcuts for most things I want to do in it, but they're often really inconvenient and I'd like to be able to change them to match those in other tools I often use.
Some other things I'd love to see in a browser:
- A command palette to make functionality & shortcuts more discoverable
- Fuzzy tab search and switcher
- Customizable split panes
On the whole I think browsers could benefit a lot by learning from UX patterns in modern editors like Atom/VSCode.