Comment 3 for bug 66977

Explanation of the patch for RMs: the bit you see is the last part of a sed expression. The full code reads:

s,^ (
    homePageDefault |
    browser\.startup\.homepage |
    browser\.throbber\.url |
    startup\.homepage_override_url
    ) \= .*
, $1.'='.$starturl ,xe or
    print "$_\nbrowser.startup.homepage=$starturl\n";