There is a bugzilla entry that states the removal was due to too little user benefit for the development effort required. And since I don't necessarily need this feature, I can understand they directed the resources to where they are needed more. Nevertheless, it would be nice to have.
The way I use it is primarily for applications that produce audio output, so I get appropriately named per-app volume sliders in pulseaudio/pipewire and not just a bunch of audio streams titled “Firefox”.
I use Brave as a secondary browser for PWAs on the desktop. I wish Firefox would support it again.
There is a FAQ about the Mullvad browser on the Tor Project's website, which gives a few more details.
For shells (and other programs) using GNU readline for interactions and line-edits (like bash), some of this can be achieved with an ~/.inputrc configuration file, e.g., mapping the correct key sequence for your terminal emulator to the backward-word move command. You can look up these sequences using infocmp -L1 or interactively using sed -n l.
Most other shells use their own command line handling routines and configuration though, so this won't work for e.g., zsh or fish.
A self-hosted instance of miniflux. After trying several other options over the years, I settled on this one.
Also, while Matrix offers E2EE, the amount of metadata the protocol generates by design is something you should be aware of.
There is also this issue with portalled rooms regarding the libera IRC bridge.
Please only do this on plans with a dedicated vCPU that isn't shared with other users.
I tend to use Firefox's "Inspect" context menu entry on the element and disable the paste/keydown/keyup event listeners in the element inspector.
If you happen to use any user script extension already (like Violentmonkey) or don't want to use a dedicated extension to fix stupid design decisions, I can recommend https://greasyfork.org/en/scripts/405614-youtube-polymer-engine-fixes.
With kernel 6.5+, the default is now amd_pstate=active for Zen systems.
I recommend amd_pstate=guided for 6.4+ though as at least on my machine, this seems to yield the best performance/energy trade-off.
With 20k GitHub stars not really obscure I suppose, but maybe someone doesn't know it:
https://gchq.github.io/CyberChef/
Works offline and you can chain recipes.