Preview Images for tabs not working very well
I'm using the tab bar on the left and I have preview images enabled. Unfortunately the preview image is only rendered once you access the page, not in the background. Furthermore the preview images are often outdated, showing page content that isn't there anymore or mostly showing just blank pages, which makes this feature pretty much useless for orientation:
If you look at the Firefox Test Pilot experiment Tab Center, it is working much better there. Preview images get rendered once you open a tab even in the background and the general generation of images works much better. Additionally I like the little icon showing the domain you're on very much:
Is this a known issue, are there plans to alleviate this?