I made a Firefox extension to open GNOME Software in the selected application panel when the Install button is clicked on flathub.org. It’s called Flatline!

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https://reddit.com/link/u3kntt/video/76ug0flfmit81/player

You can get it from the Firefox add-ons site

It supports Flathub and the new Flathub beta, which will eventually replace the current version. Also works with Apps GNOME website.

Repository:https://github.com/CleoMenezesJr/flatline

It's available for GNOME Web aka Epiphany too (WIP):https://github.com/GNOME-Web-Extensions/Flatline

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I know it's relatively simple, but the idea is to promote the use of Flatpaks by making it easy to install even when someone is on the Flathub site.