If only I could highlight text (or--dream world--make marginal annotations), this would be a perfect add on.

Completed what I wanted

This add-on is precisely what I have been looking for to over-come some design constrains in our RMA system at work. There are time significant niggles I have though.

1. The positioning of the page hacker formatting bar is relative or absolute rather than fixed relative to the viewport (using the add-on with the latest Firefox nightly as of 17:00 11/01/2018) and the manual drag and drop placement (javascript?) is a little finicky. The toolbar lags somewhat behind my cursor and until I can finesse the cursor back over 'handle' on the left hand side of the bar (which takes some doing) the toolbar follows my cursor arround the screen at a fixed distance with all of those lovely buttons and their functionality essentially out of reach. I would far prefer the bar to follow content as a scroll down the page (i.e. fixed positioning) or perhaps even as a traditional toolbar (if Mozilla ever develop a Toolbar API for Webextensions).

2. The page hacker bar appears in the print view of any given page. As I'm using page hacker to ammend reports and print them out, the result is less than desireable. It's easy enough to simply switch page hacker off after editing and before printing, but a simple @media print {display: none} rule ought to resolve the issue more elegantly. Alas, my attempts to do just thus using user-styles have failed, quite possibly due to the page hacker bar being added programatically after the page load? I've tried similar hacks to resolve the same issue with the Grammarly add-on. Again, to no avail. It seems add-on's interface elements can't be affected by user-style (at least not via Stylish).

Anyway, those two issues are the big ones which preclude me from submitting a five star review.