Hey @Masterframe
You can fill in http auth dialogs with Firefox and Chromium Based Browsers. Although it has some limitations:
Supported Actions:
Extension Button - Yes
Keyboard Shortcut - No
Behavior on Browsers:
In case extension button in toolbar can be clicked: You can click on extension button and select a item for filling.
In case extension button can’t be clicked: Open a new tab and then select a item for filling. It will launch the url saved in item and autofill.
Thanks!