Rated 4 out of 5 stars

By installing Stylish-Custom I notice that a very few number of styles have the tag SyncBackup, and I assume these are the styles that are synced. Compared to the number of styles I have installed (about 100) it's not a lot.

Luckily I can always backup and restore my styles from the addon's options menu, which is a lot easier than to do it from Stylish-Custom.