Joyreactor Improved Post

This browser application is designed only for the websites old.reactor.cc and reactor.cc.

When viewing a long post, it adds a button next to the post body
which displays the approximate number of "screens" you need to scroll to
the end of the expanded post. Clicking the button collapses the post, and
the page returns to the same location (±).

When you scroll to the end of the post, the button automatically disappears.
In the extension settings, there is an option to select the button position -
left or right of the post. To open the settings menu, simply click
the extension icon.

P.S.
If you're a rich man, there are donation buttons at the bottom of the menu.