
Fast Umlauts and Eszetts
As you type A'', a'', O'', o'', U'', u'', s'' (two apostrophes) they are automatically converted to Ä, ä, Ö, ö, Ü, ü, ß respectively. E.g. Ko''nigreich would be converted to 'Königreich'.
What is Fast Umlauts and Eszetts?
Fast Umlauts and Eszetts is a Firefox add-on by crgowen. This add-on has 23 daily active users and was removed from Firefox Browser Add-ons 8 months ago. The latest version, 1.50, was updated 3 years ago.

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Summary
When activated and enabled through the extension icon (or by pressing Ctrl-Shift-O), select a text field and begin typing (an indicator should appear top right of the text field to let you know it's working), any sequences in your text matching the umlaut phrases will be converted to umlaut characters once you stop typing and wait 2 seconds.
CONVERSIONS:
- A'' / a'' (two apostrophes) -> Ä / ä
- O'' / o'' -> Ö / ö
- U'' / u'' -> Ü / ü
- S'' / s'' -> ß
Safety
Risk impact
Fast Umlauts and Eszetts is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Fast Umlauts and Eszetts if you trust the publisher.
Risk likelihood
Fast Umlauts and Eszetts may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.