Be careful with old versions!
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-- 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.
This add-on is not compatible with your version of Firefox because of the following: