Feature request: global keyboard shortcut for link clicking

I propose to use the chrome.commands API to add a couple global keyboard shortcuts for link clicking (like f and alt-f). This way this feature will be available even when vimium is disabled on a page.

There are decent chances I would implement this if I have reason to believe it will be merged.

My usecase is that there are many sites that implement nice native keyboard shortcuts, and so I disable vimium. I still want to have a quick way of interacting with input widgets, though. I want a keysequence that is under my fingers that I can rely on.

This idea could potentially be extended to many vimium actions, but personally f and alt-f are the only ones that matter to me.

Related issues:

• See also #3161 which proposes using global keyboard shortcuts for enabling / disabling vimium.

• A decent alternative would be to support a keybinding whitelist as in #3190. I have switched to Vimium-C on my personal computers because it supports this feature, so I can whitelist f on sites that have a nice selection of native shortcuts. On my work machine I can not easily switch to Vimium-C, and instead need to use Vimium.

Start by reviewing the Chrome chrome.commands API and the related discussions in #3161 and #3190. Define how global f and alt-f should trigger link clicking while Vimium is disabled, then verify the behavior across the relevant browser contexts; the issue names no files or tests.