Jayda Fransen has been found guilty of wearing a uniform with political objectives and religiously aggravated harassment.
Fransen escaped a possible six-month jail term but was ordered to pay a total of £1,920 in fines and court costs and was issued a restraining order against the main witness in the case.
She called the verdict “absurd” and a “clear display of Islamic appeasement”.
The 30-year-old launched a tirade of abuse at Sumayyah Sharpe during a Britain First “patrol” of Bury Park in Luton at around 1pm on Saturday January 23.
Bedfordshire Police Assistant Chief Constable Mike Colbourne said: “We are committed to keeping Luton safe and peaceful and will not tolerate those who seek to provoke tensions within our communities.
“We have a duty to protect our communities and will always act in their best interests, and would seek to prosecute anyone who breaks laws under the Public Order Act.”
Things got even worse for Britain First after the first day of the two-day trial when Golding was served notice of an alleged High Court injunction breach.
The 34-year-old said he fears he could be jailed for six months if found guilty.
Britain First supporters are outraged.
During the march they handed out newspapers and confronted local Muslims in what charity Tell Mama said was an “intimidating” fashion aimed at “inflaming” tensions.
Britain First wrote that it had faced “ferocious hostility from local Muslims” during the march, and said its video was a “shocking look into the Islamisation of our beloved country”.
Its activists, the party said, were pelted with eggs and verbally abused by Muslims who claimed to have “taken over” Luton.
In an edition of “Jayda’s Soapbox” posted on Britain First’s Facebook page, Fransen had defended herself ahead of the trial.