Cannot open PDF files online with Firefox 4, help suggests foxit but don't know what that is?

Earlier versions of Firefox allowed me to open PDF files online, without downloading. Firefox 4 does not allow me to open and read PDF files online, but requires downloading to computer.
Help suggest altering settings in FOXIT READER, manually, but I don't know how to access Foxit reader, if I have it.
Can I alter settings in Firefox 4, or do I have to go back to earlier version.
Thanks

I was under the impression Foxit was a pdf viewer rather than an addon for Firefox, but maybe there is more than one application with a similar name.
I did not notice mention of foxit in the help, but add-ons are not always mentioned.
* https://support.mozilla.com/en-US/kb/Opening%20PDF%20files%20within%20Firefox#os=mac&browser=fx35
* general articles
**[[Using the Adobe Reader plugin with Firefox]]
** & [[Opening PDF files within Firefox]]

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Cannot open PDF files online with Firefox 4, help suggests foxit but don't know what that is?

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