Issue reading thunderbird webextension documentaion

michael.kluge · October 25, 2020, 8:03pm

Hi all,

i try to understand this webextension example (line 2):

thundernest/sample-extensions/blob/master/filter/background.js

browser.browserAction.disable();

browser.mailTabs.onSelectedMessagesChanged.addListener(async (tab, messageList) => {
  let messageCount = messageList.messages.length;
  if (messageCount == 1) {
    browser.browserAction.enable(tab.id);
  } else {
    browser.browserAction.disable(tab.id);
  }
});

browser.menus.create({
  id: "sender",
  title: "Sender",
  contexts: ["message_list"],
  async onclick(info) {
    let message = info.selectedMessages.messages[0];
    await browser.mailTabs.setQuickFilter({
      text: {
        text: message.author,

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After reading the documentation:

https://thunderbird-webextensions.readthedocs.io/en/68/mailTabs.html#onselectedmessageschanged

I still have no clue, why (tab, messageList) is the correct argument for the event listener? Where can I get this kind of information? What did I miss to read?

Regards, Michael

juraj.masiar · October 26, 2020, 7:30am

The link points to the Thunderbird 68, if you check the current 78, you will see the info about those parameters:
https://thunderbird-webextensions.readthedocs.io/en/78/mailTabs.html#onselectedmessageschanged-tab-selectedmessages

But I agree that the Thunderbird docs are much harder to navigate than MDN.