@alobpreis said in Blurry YouTube thumbnails text:
@mrmufa5a I can't tell you why this happens, but what I did notice is that if you download the first two, the file is a .webp one (which might be a lossless image like PNG, or just with better compression), and the Opera one is a jpg, with clearly not the best compression rate. So basically that's why you see the blurry red text: jpg compression.
Now, why Opera goes that path, I have no clue. But for sure, there's no need to play with drivers or antivirus. 
notice that too today (webp and jpg), also if you delete all the hash after jpg, in youtube with dev tools/inspect element the blurriness goes away.
(
https://i.ytimg.com/vi/gCI1L0gP-vk/hqdefault.jpg
all this
[?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLAUz6VUtsyrv5VZcfRvtnYM48ymHA]
)
PS: This post reminded me of this other one, and -oh surprise-, it's yours too. 
https://forums.opera.com/topic/56658/blurry-images
Yup, that old post, the issue was blur small images in all pages, was an issue with opera versions 72 to 87 was fix in ver. 88
.