Vimium appears to be the only usable solution to using vim-like keybindings to access browser functionality post transition to WebExtensions. Vimium requires a tab to fully load before keybindings become accessible. This is tolerable for link-following as the links need to load before the browser can be instructed to follow one. For tab manipulation however this is an unacceptable model. Is there a more appropriate WebExtensions API to use for e.g. binding `h` and `l` to switch to previous and next tabs without requiring the current document to load first?