Tip: View Firefox Cache

To quickly view what Firefox has stored in its cache on disk, type

about:cache?device=disk

in the Firefox window. There you can see the contents of Firefox's disk cache.

SEO: How to see rel=nofollow links in Firefox

Step 1: Download and install ChromeEdit Plus
Step 2: Restart Firefox
Step 3: Go to Tools->ChromeEdit Plus->ChromEdit
Step 4: Select userContent.css
Step 5: Put the following code:

a[rel~="nofollow"] {
  border: thin dashed red! important;
  background-color: #ffffcc ! important;
}