TLDR: an upstream fix in hunspell/de_DE_frami.aff from libreoffice did not make it into mozilla in three years. Why? '''The original problem:''' When typing in German on a non-German keyboard, one types "oe" instead of "ö" and "Ae" instead of "Ä" or "ss" instead of "ß". The German spellchecker with flag "fuer" as an error and correctly suggest "für" as a replacement. The way the German spellcheckers are defined, they will identify a single use of such a replacement but not two adjacent ones. This had been extremely irritating to me when I try to end my emails with greetings "Grüße". I type "Gruesse" and the spellchecker does not find "Grüße" as a correction. '''The fix:''' Back in 2022 I finally decided to try and fix this bug myself. I discovered that in order to fix it, we needed to tweak a file called hunspell/de_DE.aff or hunspell/de_DE_frami.aff. I didn't know where to submit this correction, but ultimately found the source for these files to be in the libreoffice project. They accepted my merge request in 3 years ago in September 2022. https://github.com/LibreOffice/dictionaries/pull/40 https://gerrit.libreoffice.org/c/dictionaries/+/136067 '''Today's problem:''' I was assuming that over time that change would propagate to all downstream projects using these dictionaries, but this is not the case. Today, in September 2025, using ubuntu-snap installed Thunderbird version 140.2.0esr-3, and Firefox version 142.0.1-1 I can see that neither of them include the fixed dictionary - neither in de_DE nor in de_DE_frami. So here is my question: '''Where does thunderbird and where does firefox get their language definitions from? Where do I need to submit this fix to the hunspell dictionaries in order for it to finally make it to release? '''