Much better than Firefox's built-in functionality Rated 4 out of 5 stars
That has nothing to do with NoSquint. It's a bug in Firefox (401213) that only occurs with certain themes. The developer of this extension and the theme authors cannot fix it.
This is a very handy extension. Being able to set page colors on a per-site basis is particularly useful, making NoSquint a well-rounded accessibility extension. I only have a few issues with it:
1. "NoSquint Site Settings" appears in the context menu for links. That is completely useless and only adds clutter to an already-overloaded menu. I'm not entirely convinced the same option in the page context menu should be there either, but at least it can be argued it's useful for setting preferences for sites in chromeless windows.
2. LEFT-clicking the status bar icon pops up the options window, while RIGHT-clicking it brings up the zoom options menu. That seems completely bass-ackwards to me.
3. Leaving "Disable background images" unchecked actually disables background images all the same.