Baseline Rendering Webkit vs. Firefox

I've been playing around typesetting a single column using a baseline grid. Have noticed a slight difference in Chrome/Safari versus Firefox. Webkit browsers render the baseline 1 or 2 pixels higher than the baseline in Firefox. The difference is imperceptible unless drop caps are applied to the paragraph using the p:first-child:first-letter method. All things being equal, Webkit browsers will place the drop cap baseline 1 or 2 pixels above the baseline of the body text. Firefox places the drop cap baseline flush with the baseline of the body text. Applying margins or padding to align the baselines in Webkit means that the baselines are offset in Firefox. Have found reference to this in articles on CSS drop caps but have not come across a solution. I'm keeping this little principle in mind but drop caps that don't line up with the body text can be a huge eyesore. Does anyone have any experience with this?