Not 100%, but works on most sites tried, best of all d/l apps tried. Mostly used with Firefox, couple times had to switch to Chrome, figured out that was due to ad blocker. Not used much on YouTube or social media. Very stable, and can d/l through browser/File Explorer, allowing 'save-as' renaming and changing save locations per d/l. Like the new sidebar, would like to be able to relocate it top/bottom/right, or detach it altogether. Thanks for great app!