Read the WWW::Mechanize docs, it lists the valid user agents. 'Firefox/3.5.7' isn't a valid user agent alias string. See also Firefox User Agent Strings.

Update: Yes, I messed up, I meant to say'Firefox/3.5.7' isn't a valid user agent alias, rather than string. Thanks ikegami

In reply to Re: Firefox user agent in mechanize by marto
in thread Firefox user agent in mechanize by Anonymous Monk

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