like for some other users, i couldn´t get my firefox to show the pdf, while there never was any Problem with Chrome or iE.
de-and Reinstalling of Foxitreader and the Plugin didn´t work, as well as clearing cache and browserdata or uncountable reboots - no result.
Finally I ended up copy/pasting every single URL from my test-post´s sourcecode to the adressbar (not that i expected myself to find anything that way)
BUT: By Chance I also pasted a docs.google.com-link, which told me to enter my password to proceed, with the option to log-out at the same time (o.O?).
I DID log-out my gmail-Account and voilá
- the pdf-view works perfectly in FF again o.O?!
wtf, all glory to the single-sign-on??
I remember using my gmail-Account with youtube a couple of weeks ago, and it is very likely that i simply forgot to end that session correctly.
Anyways- I was pretty sure that clearing the cache and data will do.. too bad that the Google-LogIn Form didn´t show up in the posts where the PDF was expected. I probably would have realized earlier what´s wrong.
Long talk, short resumee for those who use or did use an Gmail-Account lately:
Try logging into any Platform acessible with the Gmail-data, after that log out correctly and try viewing embedded pdf again.
It seems like Account or Browser got somehow stuck between status logged-in and logged-out, which subsequently screwed up the browsers capability to handle the googledoc viewer.
Alternatively try uninstalling whatever browser won´t work, run cccleaner and reinstall. After that try again without re-importing any sync data.
for the file: after the pdf-view being restored, I tried logging in with gmail again - both works simultaneusly now.
I hope this will help a few people at last...good luck!
(..and sorry for my bad english, the text would have been much shorter in my native language)
p.s. the part of the source-code which helped by chance:
" <div class="entry-content">
<p><![if !IE]><iframe src="http://docs.google.com/viewer?url=http [...]" <-..for problems with FIREFOX...lol