As for my own opinion - I fully agree not to ditch it right now, unless you are super privacy-concerned.
If you are, and if you think Mozilla is a lost cause, then please, as a community, get together and organise a body that is financially and legally able to carry a FLOSS browser with its own web engine. Not saying this to be snarky or as a gotcha, I am just somewhat irritated by some people saying to ditch Firefox to then say the alternative is a Firefox fork with a team way too small to handle what is needed to maintain a browser project going into the future, if they couldn't build on the upstream code.
Because if you don't organise such an organisation, including eventually financially giving to that group if you have the resources, Mozilla will remain in the ambivalent position of trying to balance markets and ideals, with less and less of a bargaining chip on the 'ideals' side - and the web will continue to be further and further dominated by non-free software trying to make web standards more proprietary.
Ich würde mich ja auch damit zufriedengeben, wenn ermittelt wird in die Richtung, und dann festgestellt: Okay, gab keine politische Motivation für jetzt genau diese Tat. Aber das wurde ja sofort ausgeschlossen.
Und selbst dann: Die rechte Szene verbreitet generell eine Kultur, die Menschenleben den Wert abspricht, und solche Taten selbst in einem nicht direkt politischem Kontext vereinfacht. Wenn man das für den Islamismus so dauerhaft wiederholen kann, dann doch bitte auch hier.