Moviesm Rogue Extension
Moviesm is the name of a browser extension that acts like adware or ad-supported software.
First of all, it should be noted that due to its undesirable behavior, Moviesm is not offered through the official Chrome Web Store. The extension is distributed through third-party websites and redirects, which should never be trusted when it comes to installing a ransom, unknown extension in your Chrome browser.
Moviesm claims it makes it easier to watch your favorite movies and TV shows. In reality, the extension asks for permission to read and modify data on pages you visit. This functionality is later abused to display ads inside your browser.
Whether those ads come in the form of pop-ups, ads embedded into pages where there were none before or some other type, you should not click on them. Rogue extensions of this type would often partner with rogue ad networks and serve their ads.
This means the rogue ads may link to questionable content, scam or phishing pages or other potentially unwanted applications similar to Moviesm.
Remember you should only ever install your browser extensions through the official Chrome Web Store and remove Moviesm from your browser if you find it in the list of installed addons.