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Re:Electron is flash for the desktop (2016) by lerpa on Tuesday April 11, 2017 @12:27PM (#14089649)
Same for Chrome: http://www.geekpen.com/wp-content/uploads/2016/12/Chrome-Mor...

Probably Firefox also has this.

Re:Electron is flash for the desktop (2016) by SlySherZ on Tuesday April 11, 2017 @04:13PM (#14092017)
I can confirm for Firefox. Right click the tab -> Pin Tab. It shows up as a symbol only (hides the title) leftmost tab and never goes away.

Here's more info, with images of how it looks like: https://support.mozilla.org/t5/Learn-the-Basics-get-started/...