->is_visible expects your XPath expression to find 0 or 1 element, not more. If you know that there will be zero or multiple elements, you can restrict your XPath expression by using an index:

//a[@class="kl"][1]

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In reply to Re^5: How to control two tabs at the same time with WWW::Mechanize::Firefox by Corion
in thread How to control two tabs at the same time with WWW::Mechanize::Firefox by mascip

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