Custom-Toolbar-Buttons-Anki
This Add-on adds a + button to the toolbar on the card editing page. Click it to insert a custom button to its left.
For Example, this User added an H₁, H₄, and a --- Button

Available button functions:
-
Insert specified content at the cursor position
For example for a line (horizontal rule):

-
Insert content to the left and right of selected text
For example for a H₁-Button:

Also added support for custom shortcuts.
Note: this is a fixed version of 457467704 on ankiweb.net, in addition I translated the add-on text to english and added support for darkmode on anki. I also added a shortcut option.