http://r53zi7kxyqd72fuvhztzi25fo2bze7fqjefze7k6t6kiq74pzaq5suyd.onion/posts/2021/2021-09-03.html
Although, you can sideload the themes and plugins you need. Another issue is that you might be confused with the directory where the configuration files are, like the profiles etc. I noticed a pattern here. The directory is at ~/.[name of developer]/[name of browser] .