When applying the update Firefox installs the latest bugfixes and then restarts the browser. At this point it then checks what extensions are compatible with the new update.

Surely there should be an option to check in advance of applying the update since certain extensions may well be of paramount importance such that it would be better to wait for them to be compatible than to update.

On a related note, Mozilla’s start page seems to be broken. Their links for images, news, etc. seem to be pointing to *.mozilla.com and not *.google.com resulting in “Server Not Found” messages from the browser.