#!C:\Perl\bin\

    use strict;

    # add library path to wherever WWW::Mechanize might be
    use lib qw(C:\\userFoo\\myperl\\lib\\site_perl\\5.8.8); 
    use WWW::Mechanize;

    my $mech = WWW::Mechanize->new();         # Create an instance of 
+mech

    my $url = 'file:///C:\Documents and Settings\userFoo\Application
Data\Mozilla\Firefox\Profiles\profileBar.default\bookmarks.html';

    $mech->get( $url );                       # Get the bookmark file
    print %{$mech->follow_link( n => 11 )};   # Get and print a link's
+ contents
[download]

Actually, now Firefox stores bookmarks in a SQLite database. The bookmark manager allows the user to export to or import from either HTML or JSON, but there is no HTML or JSON file that's automatically kept up to date.

It would require gaining familiarity with the database structure, but I assume a SQLite module could handle it fine. It's just that it's not as trivial as parsing HTML any more.

Changing browser.bookmarks.autoExportHTML from false to true in about:config should make Firefox write a classic bookmarks.html file in parallel to the SQLite database.

Alexander

--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

By 'execute a Firefox bookmark' do you mean load a URL you have bookmarked within the browser? If so then no, you can't do that purely with WWW::Mechanize. Also WWW::Mechanize doesn't deal with JavaScript. See WWW::Mechanize::Firefox or Using WWW::Selenium To Test Or Automate An Ajax Website regards automating web browsers.