Generally speaking, this addon is pretty good. Due to problems with Firefox, I'm not sure if I should give this four stars or three. Although at one point it was not incompatible, YouTube Redux is now incompatible with Firefox's built-in picture-in-picture mode, effectively rendering it non-existent and useless unless you turn off this extension. Additionally, it has clashing aesthetic issues with Styled, which provides the YouTube retro wave aesthetic, despite the fact that they both haven't clashed before. These issues have only started occurring recently and the date I'm giving this review is 8/10/2023. The only reason I'm making this review is due to the issues I've already mentioned. The YouTube Redux addon is fantastic, and I adore how it makes YouTube stop treating me like a little kid by getting rid of those enormous YouTube thumbnails, which make it more cumbersome and slow to use YouTube. Thus, I sincerely hope that whoever is working on the Firefox version of YouTube Redux may see this and address these issues, especially the picture and a picture mode issue since it is more crucial than attempting to avoid clashing with Styled.