Firefox continues to gain ground against browser market behemoth Internet Explorer.

The Mozilla Foundation's market share reached 8 per cent in May, up from 7.38 per cent in April, while Internet Explorer's slice of the pie shrunk a bit to 87.23 per cent, down 0.77 per cent, according to a statement released Wednesday by, a maker of applications for monitoring and measuring Web site usage.

Although Internet Explorer's market share is colossal, Firefox is consistently increasing its share by between 0.5 per cent and 1 per cent from month to month. Its reach is growing beyond tech-savvy early adopters and into the mass market, according to, which compiled the data from more than 40,000 Web sites monitored by its service, which identifies among other things the type of browser visitors are using.

Firefox's steady market share gains reflect that it has proved itself as a secure and reliable browser, and that it is a viable contender in the market, said Dan Shapero,'s chief operating officer.

"The message for webmasters is clear: Make sure your website is compatible with Firefox, because more and more of your visitors are using it to go to your Web site," Shapero said.

Firefox could add to its momentum if it starts to gain converts among IT departments in large companies, Shapero said. Becoming the standard browser in large companies, a segment where its adoption has been limited so far, could give a rapid boost to its market share, he said.