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Let me direct you to the next sentence:

"When you open a link that would normally be to desktop Twitter, this extension redirects you to the mobile web version and makes it wider."

Ah. Here's a simpler explanation:

> This makes Chrome always use the mobile web version of Twitter, which has a different UI to the desktop web version.

>When you open a link that would normally be to desktop Twitter, this extension redirects you to the mobile web version and makes it wider.

Requests to normal Twitter are redirected to the mobile version, which is on a sub-domain.