I had a list of over 4000+ shitty, clickbait and cancerous channels as well as channels with videos that have been in my recommendations for weeks. I accidentally blocked something wrong and it ended up blocking everything on youtube. So i had to export my list, empty it on the extension, go into the file, and remove the latest added one. But now I cannot import that list again. So all the channels i've blocked are now gone and this .json file is as good as this extension now. Worthless.