The tech-focused agency will help publicise Give As You Live, a downloadable app developed by tech company Everyclick. The app enables users to give, on average, 2.5 per cent of every pound spent online to their favourite cause.
Everyclick CEO Polly Gower said: 'Firefly understands our business model and the potential it brings to fundraising. Through our offand online campaigns, Firefly will attract retailers, charities and, most importantly, consumers.
'New unrestricted revenue streams are opening up for charities that take advantage of proven online behaviour, delivering unprecedented returns.'
As part of the brief, Firefly is providing social media campaigns and toolkits to charities signing up to Give As You Live, to help them recruit new supporters.
Sixty-three charities are already using the technology, including Breast Cancer Campaign and Starlight Children's Foundation.