The article also included pictures of MEPs from the French National Front and the Italian Lega Norda. It mentioned some of the politicians' crime records, hence the reference to arsonists in the headline.
"Maybe they consider us extremists," said Feminist Initiative's Soraya Post when the Expressen newspaper told her about the British tabloid spread.
"I don't see the connection but there are a lot of people who say feminists are extreme."
She also said that she was used to hearing the opposite, that feminists were a counterweight to right-wing extremists.
The party leader, Gudrun Schyman, said earlier on Monday that the party's parliamentary debut would hopefully act as a beacon.
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"I think we spread inspiration worldwide," she told the TT news agency. "These questions that we raise - equality and respect of human rights - they look the same across the world. I think many feminists feel very emboldened by what we have done."