Earlier quoted context omitted.
Sure, if you're willing to forgo the updates and have to manually install each time, or have the updates convert you to the branded version: https://blog.mozilla.org/addons/2016/07/29/extension-signing... (Good luck compiling it yourself.)
I compile a unbranded version of Firefox for each released version on my private repository for AUR packages, automated and without the need of intervention at all. I'm currently running the branded release but I could pick unbranded, beta, dev or nightly editions of Firefox if I wanted. It's not hard to automate and especially with the unbranded version you have permission to distribute the binary that results, a pe…
And do you plan to set that all up in the middle of your workday when a forced update disables your extensions?