Don't touch my tabs! (rel=noopener)
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Add-on summary
Hi! Did you know that whenever you click on a hyperlink that opens a page in a new tab, the new page is able to control what page is loaded in the previous tab?
"Why is this bad for me?" Advertisers are using this trick to harass everyone these days, and worse, hackers can replace the previous tab with a fake login page of the service you're navigating away from when you follow a hyperlink to an evil web page.
"That's not good! What now?" The World Wide Web Consortium (W3C) decided that something needed to be created to stop this from happening, and the "rel=noopener" attribute was born. This attribute can be added to any hyperlink to prevent the new window from accessing the previous window object.
"Sweet!" Well here's the catch: Because they didn't want to 'break the internet' this became an optional attribute that web developers and designers have to add to each single hyperlink in order to protect you. This means that trillions of Hyperlinks that do not give us this protection have to be fixed, manually, and let's be honest, this will not happen.
"Break the internet? But.. my security!" Well they do have a point in some way, since some web applications make use of this function, it would break those web applications if they would just change the way hyperlinks work.
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Risk impact
Don't touch my tabs! (rel=noopener) requires very minimum permissions.
Risk likelihood
Don't touch my tabs! (rel=noopener) may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.