I'm leaving this extension. It has a nice options page. It has a nice tutorial (which I don't read). But it

* cannot blacklist sites
* cannot indicate whether I'm in the pass mode
* cannot remember the pass mode after switching tabs / windows
* cannot support my Escape key that has been remaped using xmodmap
* has issues scrolling on some pages (e.g. its tutorial page)
* cannot exit hint mode without action
* is not actively maintained
* I cannot 'npm install' successfully to build my modified version

When this Add-on turn on, back scroll position is not saved.

Example:
browsing A-page and scroll down
click a link to B-page
browsing B-page and go back to A-page by click 'back' left-arrow icon.
When return to A-page, HOWEVER, top of A-page displays, scroll position before is not resumed.

saka key eats up Esc key events. other addons cannot use Esc key events.