Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
-- Added border to the highlighted links.
-- Dull button icon for inactive state and bright icon for active state.
-- Fixed a bug.
-- Instead of using location.hash to scroll, now it uses element coordinates.
-- Made changes as per Georg's suggestions and recommendations
-- Prefixed default preferences with "extensions."
-- Removed unnecessary files.
-- Explicitly declared all variables.
-- Added removeEventListener to remove event listeners when these are no more needed.