Working:
Downie Plugin
Humble New Tab Page
Partial Working:
Vimium It works most of the time but sometimes the key bindings just not work, so far seems pretty random
1Password Rarely works with certain websites, most of the times can load but can't copy/autofill.
Tampermonkey Reports: 1, 2
Not Working:
Hypothese
Search by Image
Zotero Connector Reports: 1, 2