This extension is simple, open sourced
and very privacy friendly. It accesses no user data for the sites listed, It merely looks for the rating bars and removes them.
No data is being sent by the extension to anyone in any form.
The Firefox extension is a bit slower to act on IMDb, while other sites work with sufficient speed. In order to increase the performance of the extension, it is recommended that you use it along with an content-blocker like ublock origin