A new Chrome extension called Image Downloader has been added to the Chrome Web Store. The extension is adware as it injects advertisements into web sites that you are visiting. It opens unwanted sites in new tabs when you interact with the site, and injects ads into the top of search engine result pages. Make sure to have an up-to-date security program installed and always check extensions permissions before allowing it to install. As a tip, only download extensions you really need and always always check the extensions permissions.
Source: https://www.bleepingcomputer.com/news/security/psa-beware-the-image-downloader-chrome-adware-extension/