Anki addon that allows you to change ease factor on cards.
In the browser, right click on selected cards or find the "Cards" entry on the menu bar. Choose "Set Ease Factor..." option from the list that appears.
In the reviewer, click on the "More" button in the lower-right corner. Choose "Set Ease Factor..." option from the list that appears.
If you don't like the changes, use Anki's default undo functionality (CTRL-Z or Edit->Undo).
Changelog:
2021-12-19 - Remember last used input. Allow multiplicative edits (e.g. "*0.8,1.2" will multiply all current ease factors by a random value between 0.8 and 1.2).
2022-03-28 - Allow simple add and multiply operations without using random ranges (e.g. "+10" or "*1.1").
2022-04-12 - Fix problems with Anki 2.1.45. NOTE: Because 2.1.45 doesn't support batch updates, undo reverts one card at a time on 2.1.45.
2022-11-06 - Show warning and abort when trying to set ease factor on new cards because Anki reverts their ease to default value after graduation.
2022-11-17 - Add option to change ease factor from reviewer context menu. Display current ease when single card selected.
2022-12-25 - Implemented keyboard shortcuts option. Default is "Ctrl+Shift+Alt+F". You can change or disable (just leave empty) in the config.