This is what I have done. You need to have your Bookmarks toolbar showing. To get this right click on a blank space on your address bar and check the bookmark toolbar. Then in Bookmarks you create a New Folder and add the websites you want to use. Then go back and right click on the whole folder and copy it. Then put you cursor on the Bookmark toolbar and right click and then paste the folder to the toolbar. To use it just click on the folder on the Bookmarks toolbar and click open all in tabs.

You can add the URLs to the target line of a copy of the Firefox desktop shortcut.

• https://developer.mozilla.org/Command_Line_Options

If you exceed the maximum length of the target line then you need to use a CMD file with the start command.

start "" "<path_to_firefox>\firefox.exe" -url <url1> <url2>

cor-el said

You can add the URLs to the target line of a copy of the Firefox desktop shortcut.

OK but the pipe symbol doesn’t seem to work. Clicking on a shortcut to multiple sites separated with the pipe symbol opens only the first site in the list. I’ve also tried using a comma, a semi-colon, a space and %7C (?). How do you separate the site names?

You can separate the URLs with space characters like I posted above.

• "<path_to_firefox>\firefox.exe" -url <url1> <url2>

I finally got it. The " - " sign was throwing me off. It doesn't work if that is included. I had to use . . .

   <path_to_firefox>\firefox.exe url <url1> <url2> 

. . . no quote marks and no minus sign.

Thank you for helping me figure this out. It has been bothering me for years.

14woody7yar said

This is what I have done. You need to have your Bookmarks toolbar showing. To get this right click on a blank space on your address bar and check the bookmark toolbar. Then in Bookmarks you create a New Folder and add the websites you want to use. Then go back and right click on the whole folder and copy it. Then put you cursor on the Bookmark toolbar and right click and then paste the folder to the toolbar. To use it just click on the folder on the Bookmarks toolbar and click open all in tabs.

Thanks for this tip 14woody7yar. I have done this now and it allows me to get to the multiple sites I was referring to from anywhere else without closing Firefox and re-opening it with the other shortcut. (didn't want you to think I was ignoring your solution)

Thanks. No worries, just giving another option. Glad it was of some help.

The docs state for the -url command line switch:

-url:
Open URL in a new tab or window, depend on the browser option. -url can be omitted.
You may list multiple URLs, separated by spaces.
Firefox and SeaMonkey only.