Sadly, this is such a massively lacking set of features that indeed it can slow productivity in some scenarios and encourage the use of the Chromium engine in one of its many iterations.

When productivity matters, Firefox is not the first choice.

And I say that with deep disappointment, as I don’t want it to be like that. I’ve tried many extensions, but they don’t fully cover all the bases that I and the people I work with would need to reach the same productivity as with the above mentioned browsers.

There's light at the end of the tunnel.

https://news.itsfoss.com/mozilla-firefox-tab-grouping/