Know when viewing non-FBA item pages
know when viewing non-FBA (not fulfilled by amazon) item pages
some chrome users: must be signed-out or have active prime account for the product page to include merchant info
all firefox users: still has old design and does not require active prime account or signed-out
runs at or after page loaded (works with product variation menu buttons)
checks for "Fulfilled by Amazon" or "Ships from and sold by Amazon.com" or "Sold by\nAmazon" text in page item-info sidebar
checks for out of stock/unqualified/partial selection/etc. item-info
if neither are found, then it puts a frame around the amazon body with blinking text label above it, and puts a blinking text label in the item-info sidebar
