hi! thanks for the review! the very simple custom firefox theme maker (without css) doesn't let us change the text beyond color, but I think using certain light/dark color combinations forcibly adds a shadow which might make the blurry effect you're talking about. i will see if changing the inactive tab color a bit will clear it up! i think i previously thought it looked kind of neat with this theme but looking now i understand the frustration, so i'll see if i can fix it. it takes a while for new versions to get accepted so i'll toy with it a couple times and try to update this comment if i fix it, but feel free to check back later & update for the new versions in case I'm able to fix the blurriness! take care.

Edit: a few hours later and the new version was finally approved! it looks like the blurriness is gone! Feel free to update the theme to version 3.0, hope you like it better. Thanks again for pointing it out!