The commission's charges stemmed from a filed by Norwegian browser maker Opera.

Today, Baker, who has been on the topic since January, argued that if the proposal is accepted, IE will still enjoy most-favored-browser status.

"Even if everything in the currently proposed settlement is implemented in the most positive way, IE will still have a unique and uniquely privileged position on Windows installations," Baker said. She listed several aspects of the proposal that trouble Mozilla, including IE's continued prominence on the desktop, the unfair advantage IE would have even if other browsers can be downloaded, and the possibility that Microsoft might try to convince users to switch back to IE through manipulation of Windows Update, the operating system's default update service.

"The importance of the myriad of details makes it very difficult to predict how effective the proposed remedies will be, or the extent of any side-effects," Baker said.

While Baker used broader strokes to paint the proposal as unclear at best, unfair at worst, . Among his concerns: Windows Update; IE's ties with other Microsoft software, particularly Office; the download conundrum competitors face; and Microsoft's plan not to eliminate IE if the user chooses an alternative.