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When opening new Internet Explorer window, a new browser session is issued. Therefore you can login with two different accounts on the same service (let's say Gmail). The same does not apply when opening a new tab in the same window in Internet Explorer.

How can I get a new browser session when opening a new tab or window on Firefox?

How about Google Chrome?

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IE 8 does not open new windows in a new session, at least not by default. However, it has a handy-dandy "New Session" command in the File menu. You can also get a new session by adding the -nomerge option to the command line, e.g. of a shortcut. – Martha Mar 24 '10 at 18:14
Thanks for the tips! – Mercer Traieste Apr 2 '10 at 7:51
up vote 9 down vote accepted

In Chrome you can use private browsing to achieve the same.

Chrome - Wrench(tools) menu/open new window without history

In Firefox you can use IE tab extension, and have another tab rendered with an IE engine to achieve the same effect.

Here are some other options:

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Doesn't Firefox's private browsing session close the current session though? so you can only have one session in Firefox. – Sam Hasler Jul 15 '09 at 12:43
ups, you're right, haven't noticed that. :( I guess than he can use the IE Tab extension for this purpose although it is less than ideal. – Robert Ivanc Jul 16 '09 at 19:10
This is as close as it gets, and i will accept this. Thanks! – Mercer Traieste Jul 19 '09 at 16:31
Using the IE tab is just like using another browser, and won't work in most operating systems. – Hugo May 3 '10 at 6:24
Unfortunately it seems that in Chrome while a private browser window will operate in a new session, all such windows are in the same session—for a total of two. – Jesse Glick Feb 1 '13 at 21:07

This Firefox extension allows that:


Multifox is an extension that allows Firefox to connect to websites using different user names. Simultaneously!

For example, if you have multiple Gmail accounts, you can open them all at the same time. Each Firefox window, managed by Multifox, accesses an account without interfering each other

Each Multifox window is flagged with a number indicating the identity profile. Logins made in windows with different numbers are isolated.

Logins are preserved the same way they are in “regular” windows. Even if you close the window or quit Firefox.

The identity profile of each window is preserved when Firefox restores the session.

It can also easily switch between profiles:
enter image description here

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Tried it, works flawlessly! – That Brazilian Guy Nov 22 '13 at 23:44

It seems that there is a handy Chrome extension called "Session Buddy" that does just this:

enter image description here

Session Buddy is a flexible session management extension that allows you to easily save, edit, and restore your browser sessions.

  • Quickly save the current session from the Session Buddy interface or from the right-click menu on any web page.
  • Flexible restore options allow restore of sessions into the original set of windows, a single window, or the current window.
  • Automatic capture of your 10 most recent sessions is especially handy for recovering a session after a browser or system crash.
  • Name and edit your saved sessions with ease.
  • Populate a session from a simple list of URLs.
  • Export a session to text or CSV format (more formats in development).
  • Control the types of tabs that Session Buddy recognizes.
  • Keyboard shortcuts make working with sessions a snap.
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This is for the "current windows and tabs" definition of session, not the "active cookies" definition that the OP is looking for. – Ben V Aug 28 '15 at 17:52

For Google Chrome, you can set a shortcut to open up an Incognito session via the following:

"C:\path-to\chrome.exe" /incognito

Or simply CTRL + Shift + N while using the normal state. Only difference is that when you're incognito, the cookies and history won't stick.

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I've opened 3 different sessions with incognito and it works fine :) – Adi Mor Dec 16 '12 at 6:31
But you cannot use password managers addons in Incognito. – Boris_yo Nov 2 '13 at 23:28

By creating multiple profiles in the profile manager (firefox -p from start menu) and then creating a MOZ_NO_REMOTE environment variable with a value of 1, Firefox will allow multiple sessions in multiple windows.

I've tried it myself with Firefox 8 and it works. I have an web application that has no logout button, and before I found this I had to keep opening and closing Firefox completely to switch between accounts (admin and user for testing). This has helped greatly.

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I have made a Chrome extension that allows you to use multiple Gmail accounts (and other accounts) by launching Chrome in a new session.

It is called New Chrome Session, and you can download it here:

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That doesn't look like a Chrome extension, plus it's Windows-only. – Michael Teper Sep 16 '15 at 23:37
@MichaelTeper What makes you think it doesn't look like a Chrome extension? And yes, it's Windows only. Chrome extensions aren't allowed to execute their own processes so it requires a process outside of Chrome to start up a new Chrome in the new context. In any case, this has been re-written to be simpler (as a non-extension) and you can get the updated source code here: – Brad Sep 16 '15 at 23:39

Chrome is bringing multi profile. Already available in canary builds. You can switch profile instantly.

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With Firefox the solution in Enable multiple sessions in Firefox worked like a charm!!

It's almost the same as proposed in the answer by "Shawn", "MOZ_NO_REMOTE environment variable with a value of 1". It adds an advice for creating multiple links on desktop for opening the different Firefox sessions.

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This can also be done with firefox.exe -no-remote -p "profilename". – Bob Mar 6 '12 at 11:13

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