Mozilla co-founder and Javascript creator Brendan Eich's ascent to Mozilla CEO has prompted a boycott over his support for Proposition 8, California's 2008 voter-approved constitutional amendment restricting marriage to heterosexual couples, which the courts have since struck down.

Eich, who donated $1,000 to the campaign to approve Proposition 8, was named CEO on Monday.

Hampton Catlin, creator of Wikipedia Mobile and CSS extension language Sass, and his husband Michael are co-founders of Rarebit, a development firm set to release a dictionary app to the Firefox Marketplace.

The Catlins said in a blog post that they have decided to “boycott all Mozilla projects.”

“We will not develop apps or test styles on Firefox any more,” the couple wrote.

“This is in protest of the appointment of Brendan Eich to the position of CEO of the Mozilla Foundation, where he had previously served as CTO. We will continue our boycott until Brendan Eich is completely removed from any day to day activities at Mozilla, which we believe is extremely unlikely after all he's survived and the continued support he received from Mozilla.”

“Brendan Eich was an active supporter of denying our right to be married and even to start this business,” the couple wrote, a reference to Michael Catlin's visa status.

Eich responded to the controversy in a blog post, saying he wanted to express his “sorrow at having caused pain.”

“[It is] my personal commitment to work on new initiatives to reach out to those who feel excluded or who have been marginalized in ways that makes their contribution to Mozilla and to open source difficult,” Eich wrote.