One comment about using Safari.
Yesterday, I thought that it would be neat to do the income taxes for my son (he owes quite a bit). Going to irs.gov all sort of stuff is available, including the ability of doing the returns on .pdf files. I backed up the files, at different times, but did not check them. I had the backed up files directed to the desktop. The return was not completed, and I backed up the file one more time. When I exited, there was no backed up file. After much cussing, I redid the form in Firefox, and found that the incomplete file had been backed up, as a .pdf file. Flock gave me the same option as Safari, i.e. to save the 1040.pdf as All Files. However, Flock saved the file, but Safari did not.
And, to those people who freak out because such files need to be downloaded, and opened outside the browser, I have an answer. File|Save does nothing, in Safari at least, but the icons in Adobe Readers do work, but, still no saving.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:220.127.116.11) Gecko/20080311 Firefox/18.104.22.168