"A browser extension is a plug-in that extends the functionality of a web browser in some way". - Wikipedia.
Unfortunately, there are extensions that may hinder the web browser (and sometimes your entire computer), and make it slower.
Most of the extensions can be removed through the web-browser itself, however there are some extensions that can only be fully removed via the control panel (Windows users).
Select your browser and follow our tips on how to remove browser extensions safely.