If I sign in to firefox sync on a fresh browser, it auto installs my extensions, but tabs-aside installs with default options and asks me to go through them.

I would like to skip this step and start configured as on my other browsers already.

This might not be true for all options, lets say 'Use context color for browser action' might not work the same on windows and linux, so probably it should not be synced, but most options should.