Looked into this once more, sorry for marking it as an enhancement back then, it is definitely a bug. This doesn't seem to be a regression, mozregression went back to 2018-04-30 (in this builds the addons wouldn't install due to the corrupted error) and the next build from 2018-05-01 already has this bug. It happens for dictionaries that have the same name. If I install a Lithuanian dictionary I can select it from the context menu. The ones mentioned by the reporter in comment 5 don't even show up in the context menu. STR: 1. Launch Firefox with a new profile 2. Install the following dictionaries: https://addons.mozilla.org/en-US/firefox/addon/british-english-dictionary/ https://addons.mozilla.org/en-US/firefox/addon/british-english-dictionary-2/ 3. Go to Pastebin.com 4. Right-click on the text input field -> Languages Actual: Only English (United States)" / "English (United Kingdom)" appear in the context menu. The second United Kingdom (british english) dictionary does not appear in the context menu. Updating affected flags and removing regression-window wanted keyword.
Bug 1490739 Comment 10 Edit History
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Looked into this once more, sorry for marking it as an enhancement back then, it is definitely a bug. This doesn't seem to be a regression, mozregression went back to 2018-04-30 (in this builds the addons wouldn't install due to the corrupted error) and the next build from 2018-05-01 already has this bug. It happens for dictionaries that have the same name. If I install a Lithuanian dictionary I can select it from the context menu. One of the ones mentioned by the reporter in comment 5 don't even show up in the context menu. STR: 1. Launch Firefox with a new profile 2. Install the following dictionaries: https://addons.mozilla.org/en-US/firefox/addon/british-english-dictionary/ https://addons.mozilla.org/en-US/firefox/addon/british-english-dictionary-2/ 3. Go to Pastebin.com 4. Right-click on the text input field -> Languages Actual: Only English (United States)" / "English (United Kingdom)" appear in the context menu. The second United Kingdom (british english) dictionary does not appear in the context menu. Updating affected flags and removing regression-window wanted keyword.