Translate on modifier key pressed in Firefox on Mac

[simontom]

Hi,
I expect this feature to show the bubble with the translation, but, apparently, I cannot use the Mac's keys or it just doesn't work.

The checkbox is ticked, tried all the choices and nothing.

However, translate selected text shortcut works (after changing it)

But that is too slow way.

Yes, I'm used to use
https://addons.mozilla.org/en-US/firefox/addon/google-translator-webextension/
which could do that, was able to find more correct spelling (e.g. for "aparentely" offer a correct one "apparently")

Exported settings:

{
  "translationApi": "google",
  "deeplPlan": "deeplFree",
  "deeplAuthKey": "",
  "targetLang": "cs",
  "secondTargetLang": "en",
  "ifShowCandidate": true,
  "whenSelectText": "dontShowButton",
  "ifCheckLang": false,
  "ifOnlyTranslateWhenModifierKeyPressed": false,
  "modifierKey": "shift",
  "ifChangeSecondLangOnPage": true,
  "isDisabledInTextFields": false,
  "isDisabledInCodeElement": false,
  "ignoredDocumentLang": "",
  "disableUrlList": "",
  "waitTime": 500,
  "ifChangeSecondLang": true,
  "ifShowMenu": true,
  "pageTranslationOpenTo": "newTab",
  "theme": "system",
  "buttonSize": "32",
  "buttonDirection": "bottomRight",
  "buttonOffset": "11",
  "width": "311",
  "height": "211",
  "fontSize": "14",
  "panelReferencePoint": "bottomSelectedText",
  "panelDirection": "bottom",
  "panelOffset": "11",
  "isOverrideColors": false,
  "resultFontColor": "#000000",
  "candidateFontColor": "#737373",
  "bgColor": "#ffffff",
  "isShowOptionsPageWhenUpdated": true,
  "isDebugMode": true
}