Storage Manager is an unwanted extension designed specifically for Google Chrome. This extension is spread through fake software or browser update alerts. Don't interact with such fake alerts! The extension may operate as adware by displaying the tremendous portion of annoying ads not related to the sites that you visit. Get rid of it with Combo Cleaner Antivirus via the official page - https://www.combocleaner.com or, optionally, follow the manual recommendations provided in the video tutorial on how to fix your browser.