@pojntfx @jimmac this, and the lack of ability to handle large amounts of tabs (both performance and UX) is what's keeping me from using Epiphany for more than just standalone web apps and occasional testing. I don't have the luxury to limit myself to a dozen tabs.
For UX, what I want is:
* Workspaces: https://gitlab.gnome.org/GNOME/epiphany/-/issues/1835
* Vertical tabs: https://gitlab.gnome.org/Teams/Design/whiteboards/-/issues/44
In terms of performance:
* Automatic unloading: https://bugs.webkit.org/show_bug.cgi?id=291369
* https://gitlab.gnome.org/GNOME/epiphany/-/issues/1454
* https://gitlab.gnome.org/GNOME/epiphany/-/issues/2796

The current posterchild of this feature is the "Simple Tab Groups" Firefox extension, the most reliable and well-rounded successor to the defunct...
@jimmac I tried it last week on Ubuntu 24.04 using Flatpak (latest stable version) and:
- loading a page took ages
- during which all the controls were blocked (including the X to close the browser)
- when the page finally loaded, it didn't scroll.
I guess I could try again and report a bug, but it's already my day job, so... 😂
Installed latest Web from flatpak.
Start it, and try to access `franceinfo.fr`.
The page loads briefly, then this appears:
I cleared all the Web data from the Preferences and reloaded the page: the whole thing freezes for a while, then the Oops! page appears again.