The Ge'ez input method extension from Selam Alem.
The Geezr input method extension from Selam Alem lets type in Ge'ez in the Google Chrome (or Chromium) browser. Once activated in a tab, selecting an editable toolbox will let you enter any Ge'ez based characters by entering a combination of keyboard keys. The combination of keyboard keys to be used is straightforward and intuitive. You can find a list of enabled characters and the keyboard combination needed to enter them here: https://www.selamalem.com/help/keymap/.