Glad you ask.

Great convenience with these little-known gems:

* "It's All Text" -> edit any text input area in your favorite editor, since after all it's all text. Hope the author updates quickly to webextensions.

* "Easy Copy" -> many use cases, for example select relevant words in any page, copy as Markdown link (or other markup) and paste in your other editor. Easy to adapt to any sane markup language.

Also:

* Display #anchors

* uBlock Origin

Given up Ghostery for shady business model.