Mozilla, CEO John Lily said that ties with Google have gotten complicated since Google launched its own browser called Chrome.

“We have a fine and reasonable relationship. But I’d be lying if I said that things weren’t more complicated than they used to be,” said Lilly.

“At this point, one in five users of the Internet uses Firefox,” Lilly said, citing statistics from Net Applications Inc. “That’s good, and we’re proud of that. When we launched Firefox 1.0 [four years ago], the odds of getting to 20%, most would have said that was impossible.”

Bulk of Mozilla’s revenues about 88%, or $60 million comes from Google. Google pays Mozilla making its search engine the default on Firefox, and for click-throughs on ads placed on the ensuing search results pages.

However, just last week Google replaced Mozilla as the default engine on Google Pack with its own browser Chrome.

At the present Mozilla is dependent on Google for revenue however the Lily said there are other opportunities. Mozilla plans to explore diversifying search revenue and perhaps partner with country-specific search firms that, in their own markets at least, are strong alternatives to Google.