Gmail Checker version 2.1 beta is available. Get it here (30 KB).

New features:

• option to check mail in Gmail's mail fetcher accounts
• toolbar button
• option to show messages in the main menu as in version 1 instead of in the submenu (see screenshot)

Gmail Checker version 2 has been released. You can get it from addons.mozilla.org or from here.

A new notification option has been added (asked long ago and recently reminded).

Refer to the previous post for some important notes in this version.

Update: 19/3

I've just found a way to check mail in Gmail mail fetcher's accounts as requested here. This feature will be available in the next release, i.e. version 2.1.

Gmail Checker version 2 (aka Multiple-Account Gmail Checker) is available. Download it here (26 KB). It's a beta release for now so feature suggestions are welcome.

A few important notes:

• You don't have to create accounts in the extension's account manager to check mail in multiple accounts. Just select "Log in new account" and enter another account details. A bit labourious but it works for anyone who likes the way version 1 does.
• You can leave the password field blank when creating or modifying an account in the account manager. It'll prompt you to enter your password when needed, and it's all the same as case 1, except that your username has already been filled in the login window.
• The option named "Remember me" in the login window has been changed to "Remember login session". Different wording, same thing, i.e. your login cookies won't expire after you've closed the browser. This is the same as selecting "Remember me on this computer" on Gmail.com.
• Auto-login is nothing special. It's the same as clicking on the status-bar icon when the browser first loads up. Hope it clears things up.
• Your settings are stored in a file called gmailchecker.sqlite under your profile directory.
• Questions? Feel free to ask.

And a screenshot