simplePage by thornjad

simplePage make text pages more readable, with less frills and less breakage than reader mode. With the click of a button in your address bar, turn any text page into a readable, narrower, centered experience. That's it, no changes to images or formulae; reader mode at its most minimal.

Permissions needed:

• Access browser tabs: simplePage adds a button to the address bar of every tab.
• Access your data for all websites: simplePage stores whether its simple viewing mode is active in a cookie, and so it needs access to cookies.

Unsure about trusting simplePage? Read the source code yourself!