After Conversion with our SeaMonkey-Add-On-converter the dictionary also woks fine with SeaMonkey German 2.39 final Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0 from official download area) Gecko/20100101 Firefox/42.0 Build 20151103191810 (Classic Theme) on German WIN7 64bit. @Stepen: It would be great if you could add SeaMonkey as compatible application, please contact me via "Bug 1236807 - Encourage FF and TB dictionary authors to make available their add-ons for SeaMonkey"
It was useful up until being disabled by the latest version of Firefox. Providing add-ons to Firefox is always going to be a significant, ongoing commitment as they need to keep up with verification for operation with rather swiftly moving Firefox upgrades.
Update: Language packs are exempt from the signing requirement, however the add-on does not have its type set (I'm not even sure if add-ons had types when I created it). The fine folks at Mozilla have detected the problem and will automatically set the type correctly soon, so the problem should go away. If not, I will upload a new version with the correct type.
Received an email saying there would be no compatibility issues with v43. Was not aware of this new signing requirement. Will investigate and sort it out next week when I have some free time.
This add-on is compatible with FF 11 and 12, and I really like the idea. Unfortunately, I have to keep on right-clicking in text boxes and then selecting NZ English as my language. 4 Stars (sorry if the right-click thing is not to do with your add-on).