Key Jump keyboard navigation alphanumeric per Quantenzitrone

This is a fork of this adding an option for navigation with a custom set of keys (instead of only numbers).
See this pull request.
The original developer seems to be busy right now.

Press , (comma) on your keyboard to show hints for all links, buttons, text fields and other things you can click or focus.

Press . (period) instead to open links in new tabs when they are clicked.

These shortcuts can be changed in the add-on options.

Hints will be automatically triggered when possible. You can disable this in the add-on options.

Press Escape to hide the hints.

If you find any bugs or have suggestions please submit a new issue here:
https://github.com/KennethSundqvist/key-jump-browser-extension/issues
If the bug is related to the alphanumeric feature, please leave a comment on the pull request
https://github.com/KennethSundqvist/key-jump-browser-extension/pull/67