Life in plastic, it's fantastic!
When an HTML element defined with the '<a>' tag (a link) is clicked, the current web location changes to the official video of Barbie Girl by Aqua uploaded on YouTube by AquaHoldet (https://youtu.be/ZyhrYis509A?t=15). This extension is intended to be used as a friendly prank.
Code: https://github.com/jmt-chromeextensions/HiBarbie
FYI: Extensions are not activated automatically when they are installed. This extension, like many others you have tried probably, starts working on all the corresponding tabs at the right moment it is installed, but this is not the default behaviour. Take in mind that if you install an extension sometime and it doesn't work on the tabs you have already open, you may need to refresh those tabs with F5 key or by clicking on the reload button located in the browser's top left corner.