Innocent addon developer.... Rated 5 out of 5 stars
For those who are not satisfied with the addon pushed by Microsoft, you may share your experience on this page: https://addons.mozilla.org/en-US/firefox/addon/9449
Please do not rate down this addon because of Microsoft's unfriendly act. They are not linked to each other.
Really do not hope the effort of those most respectful addon developers are affected by the bad tactics used by a corporation.
BTW, the security concern is another issue to be considered for addon installation.