Mark Location is a Firefox add-on that helps you bookmark and navigate to specific locations on a page, making it easier to jump around and find the information you need.
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While reading a wall of text you might want to jump around the page and if there are no links, finding the parts you want to check often can be tedious. This add-on helps you in that goal by allowing you to bookmark those locations.
In the new version (0.5) you can have permanent marks for pages. They will last until you clear them. This is now a default setting for new installs. Or you can change to have volatile marks that disappear if you refresh the page.
You can configure your own key shortcuts (any won't work, for example shortcuts that Firefox uses) for marking and scrolling in the settings.
Permanent marks use IndexedDB for saved images. So they might be deleted in some case. You might need to refresh page to update marks in some edge cases, as if you have the same page (exact URL) open in several tabs or if you switch between permanent and volatile marks.
Extension do it's job, but usability is awkward.
0. Default shortcut key Ctrl + . is colliding with Multi-Account Container extension popping up it's dialog.
1. Without clear note how shortcut keys work I had to fumble around to figure it out even after reading comments here.
2. Alt + key combinations are not accepted for some reason although in other extension works fine.
3. Ctrl +[ is accepted, but Ctrl + ] is not, weird, same with some other keys.
4. Marks drop down list is prone to accidents. I'd very much prefer something like this:
Currently:
[1][Mark][Scroll]
[2][Mark]
Proposition:
[1][Go to][X]
[2][Mark]
Currently "Mark" button is always under the mouse provoking accident click destroying existing mark. Replacing existing button function eliminates accidents. [X] button clears mark allowing to mark it again. Also it would be nice if assigned mark buttons have background color highlight to make them move visually distinguishable from empty slots. For the same reason I made it "Go to" with space in the middle instead of single word "Scroll".
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EDIT: It works now, thanks Developer
Marking don't work on local files, e.g. file:///E:/folder/page.html