Fokus by Aaron R

Fokus uses JavaScript to emphasize anything you select by covering the rest of the page with semi-transparent black.

You can try it out here http://lab.hakim.se/fokus/ before installing.

The plugin comes with a few options that can be accessed from the Firefox add-on settings page (about:addons). These options allow you to:
- Adjust overlay opacity
- Specify a modifier key shift/ctrl/alt/cmd which must be held down to active the overlay
- Adjust the padding around selection

MIT licensed

Copyright (C) 2012-2017 Hakim El Hattab, http://hakim.se and Aaron Raimist