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Comment by mrob | Hacker News Reader

To this I would add:

  middlemouse.contentLoadURL=false

This anti-feature means missing the target of a middle-click by a single pixel can leak the contents of your clipboard or load unexpected URLs. I don't understand why it's still on by default -- Mozilla has been willing to break peoples workflow for UI improvements many times before.

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> middlemouse.contentLoadURL=false

This is the default in Firefox 57 and later. See https://bugzilla.mozilla.org/show_bug.cgi?id=366945

> I don't understand why it's still on by default

It's not.

I don’t understand, what does it do?

Seems to only apply to Linux, but basically it either pastes your clipboard content into any focused text field or tries to open the clipboard contents as an URL (and falls back to Google Search if that fails).

When set to true, lets you middle-mouse-paste into the content area to load the url in the PRIMARY selection. That way you don't have to worry about whether selecting the text in the URL bar so you can replace it with the URL will clobber PRIMARY.

Only relevant on X, where there is a PRIMARY, of course. See https://unix.stackexchange.com/a/139193 for a quick description of what PRIMARY is and how it differs from CLIPBOARD.

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