WebExtension Experiments are effectively that escape hatch. They have more or less the same access to the internal APIs as legacy add-ons, with the only restriction being that you can only install them on Nightly and Developer Edition.
The intent is to have a way to prototype new WebExtension APIs (like hiding individual tabs, or the entire tab bar, or new theme APIs), but there's no requirement that they ever get merged upstream. You're welcome to build and distribute your own for whatever purpose you might want.
The intent is to have a way to prototype new WebExtension APIs (like hiding individual tabs, or the entire tab bar, or new theme APIs), but there's no requirement that they ever get merged upstream. You're welcome to build and distribute your own for whatever purpose you might want.
https://webextensions-experiments.readthedocs.io/en/latest/