Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
uBlock Origin - Popular and efficient blocker for Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Adblock Plus - AdBlock Plus is a browser extension for Firefox, Chrome, Opera, and several other popular browsers that prevents intrusive ads like pop-ups and malicious code from appearing on websites you visit.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
AdGuard - Surf the Web Ad-Free and Safely. Shield up!