browse-url-firefox is an interactive autoloaded compiled Lisp function in `browse-url.el'.

(browse-url-firefox URL &optional NEW-WINDOW)

Ask the Firefox WWW browser to load URL.
Default to the URL around or before point. The strings in
variable `browse-url-firefox-arguments' are also passed to

When called interactively, if variable
`browse-url-new-window-flag' is non-nil, load the document in a
new Firefox window, otherwise use a random existing one. A
non-nil interactive prefix argument reverses the effect of

If `browse-url-firefox-new-window-is-tab' is non-nil, then
whenever a document would otherwise be loaded in a new window, it
is loaded in a new tab in an existing window instead.

When called non-interactively, optional second argument
NEW-WINDOW is used instead of `browse-url-new-window-flag'.

On MS-Windows systems the optional `new-window' parameter is
ignored. Firefox for Windows does not support the "-remote"
command line parameter. Therefore, the
`browse-url-new-window-flag' and `browse-url-firefox-new-window-is-tab'
are ignored as well. Firefox on Windows will always open the requested
URL in a new window.