Everybody has their thing, but Tile Tabs was a killer app for me, and had no real equivalent in any other browser platform.
Bug 1318532 had a patch submitted which provided a WebExtensions-compatible API which would allow the original implementation to work, but this was spiked permanently because of :reasons: The developer, DW-dev has been gamely trying to provide similar functionality via implementing a browser-managed tiling window manager, but this seems doomed to failure since it is at the mercy of the display rendering on the target OS. For example, on MacOS, a massive shadow is rendered around an active window, which thus renders over the top of a neighboring tiled window.
Doubt this one will get fixed ... unless Chrome implements it. Right now the objective seems to be full Chrome "compatibility" and Chrome doesn't have it.
I don't have an example handy, but when FF 57 was first released, I actually took the effort to check what are the prospects of extensions I use in future FF versions. I found at least one extension which required a feature that FF developers refused to fix because it would expose APIs they didn't want to expose, end of story. So it's not just a matter of "scratching your own itch", a lot of it is politics.
Bug 1318532 had a patch submitted which provided a WebExtensions-compatible API which would allow the original implementation to work, but this was spiked permanently because of :reasons: The developer, DW-dev has been gamely trying to provide similar functionality via implementing a browser-managed tiling window manager, but this seems doomed to failure since it is at the mercy of the display rendering on the target OS. For example, on MacOS, a massive shadow is rendered around an active window, which thus renders over the top of a neighboring tiled window.
Doubt this one will get fixed ... unless Chrome implements it. Right now the objective seems to be full Chrome "compatibility" and Chrome doesn't have it.