Bugzilla

To better understand users’ behaviors around printing, add the following probes (Listed in order of highest to lowest priority):
- [[done](https://bugzilla.mozilla.org/show_bug.cgi?id=1600623)] Number of times the print dialog was opened and nothing was printed ("Cancel" is selected)
- [[done](https://bugzilla.mozilla.org/show_bug.cgi?id=1600623)] Number of users who export to PDF from the print dialog or preview
- The amount of time a user spends on the print dialog/interface before exiting the dialog
- If websites that are printed have a CSS print style sheet
- If people are printing HTML pages or PDFs
- A counter for each of the following print settings (incremented if they are adjusted at least once for each instance of a print dialog opening):
1) Pages 
2) Margins
3) Layout
4) Paper Size
5) Background color and/or Background images
6) Page Headers
7) Page Footers
8) Scale