It can often be useful to have multiple Firefox browsers open at the
same time. Particularly for testing web sites or any sort of web
development. Or even just so you can be logged into two sites at the
same time with different accounts.
Firefox provides such a feature with the -no-remote switch. The first step is to create multiple Firefox profiles. To do this, launch Firefox with the -ProfileManager switch.
On Windows click Start > Run then:
On *nix launch the command:
Then create a new profile. If you want to make a copy of your existing profile, simply create the new profile, then copy the current profile directory to the new profile directory.
Now you’re ready to launch Firefox with the -no-remote switch. The trick is that you need to select your second profile when you launch your second instance. So start Firefox as normal, then launch a second browser.
On Windows click Start > Run then:
On *nix launch the command:
Now you should have two separate Firefox windows, each running independently of each other. If you click on links in another program, they will probably go whichever Firefox window you opened first. Enjoy.
Firefox provides such a feature with the -no-remote switch. The first step is to create multiple Firefox profiles. To do this, launch Firefox with the -ProfileManager switch.
On Windows click Start > Run then:
"C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -ProfileManagerOn *nix launch the command:
firefox -ProfileManagerThen create a new profile. If you want to make a copy of your existing profile, simply create the new profile, then copy the current profile directory to the new profile directory.
Now you’re ready to launch Firefox with the -no-remote switch. The trick is that you need to select your second profile when you launch your second instance. So start Firefox as normal, then launch a second browser.
On Windows click Start > Run then:
"C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -P "secondprofilename" On *nix launch the command:
firefox -no-remote -P secondprofilename
Now you should have two separate Firefox windows, each running independently of each other. If you click on links in another program, they will probably go whichever Firefox window you opened first. Enjoy.
List of command line arguments (incomplete)
See also the external links at the bottom of this article.| Command | Result | Example |
|---|---|---|
| profile "<path>" | Starts with profile located at the given path. Does not apply to Mozilla Suite/SeaMonkey 1.x | firefox.exe -profile "E:\myprofile" |
| P "<profile name>" | Starts with a given profile name (profile name is case sensitive). | firefox.exe -P "Joel User" |
| <url> | Launches the application and opens the given URL(s). | firefox.exe "www.mozilla.org" "www.mozillazine.org" |
| safe-mode | Launches the application with extensions disabled and the default theme. Does not apply to Mozilla Suite/SeaMonkey 1.x | firefox.exe -safe-mode |
| no-remote | Enables running multiple instances of the application with different profiles; [1] used with -P Does not apply to Mozilla Suite/SeaMonkey 1.x | firefox.exe -no-remote |
| height <value> | Sets height of the startup window to <value>. | firefox.exe -height 600 |
| width <value> | Sets width of the startup window to <value>. | firefox.exe -width 800 |
| ProfileManager | Starts with Profile Manager. | firefox.exe -ProfileManager |
| CreateProfile | Create a new profile | firefox -CreateProfile test |
| migration | Starts the application with the Import Wizard Does not apply to Mozilla Suite/SeaMonkey 1.x | firefox -migration |
| console | Starts the application with a debugging console. | firefox.exe -console |
| jsconsole | Starts with the Error Console (Javascript Console). | firefox.exe -jsconsole |
| inspector <url> | Starts with the DOM Inspector. | firefox.exe -inspector http://www.google.com/ |
| chrome <url> | Loads the specified chrome. | firefox.exe -chrome chrome://inspector/content/inspector.xul |
| new-window <url> | Loads a URL in a new browser window. | firefox.exe -new-window <url> |
| new-tab <url> | Loads a URL in a new tab. | firefox.exe -new-tab <url> |
| install-global-extension "<path>" | Installs an extension globally. | firefox.exe -install-global-extension "C:\Temp\extension-file.xpi" |
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