freeman
I hope their values are not "get some good press".
Firefox being banned (or even chrome) won't change the outlook of Russians more than... fighting a friggin war (and doing badly).
You can still get the plugins via other means (getting them from somebody who already had them, getting a non flagged vpn to access the store).
In this context it's better for Firefox not to be the illegal unpatriotic software.
They don't block them. They stopped distributing them in Russia.
They are not disabling installed addons and you can always install addons from a file in Firefox.
Yes it will be more difficult to install and more risky to get a tampered version of the extension but if they did not comply the same problems would exist and extend to the actual browser.