I have the PDF "GNU Image Manipulation Program: User Manual" downloaded to both my Windows PC, and my iMac OS X v.10.9.5.
The search function works perfectly in my PC, using Adobe Reader, but it doesn't work at all in my Mac, using neither Preview, nor Firefox browser. Not even my newly-acquired (in a desperate attempt at the end of a long frustrating day of troubleshooting as best i know how!) Skim PDF reader!
I tried re-downloading the PDF file to my Mac, still no luck. Then, I thought, maybe it's the reader; perhaps there's some quirk in this "GNU" PDF, that makes most readers unable to recognize all its text as a fully searchable component? (And maybe Adobe Reader is extra powerful in that regard?)
(I tried then double-checking, to be sure that i could use the search function on my Mac in other PDFs, and yes I can! I searched through every one I tried perfectly, and I tried several, — all except this "GNU" PDF work fine!
Unfortunately, when I searched online for an Adobe Reader download for my Mac, it seems that it does not exist for Mac!
Maybe the reason I couldn't make at least my Firefox search in this "GNU" PDF in my MAC, is due to the add-on which i have only for Windows not for Mac:
Adobe Acrobat 184.108.40.206 PDF Plug-In For Firefox 11.0.8. It seemed perhaps a more functional app than Preview, or than the app I now have in Firefox on MAC, which is the built-in Firefox PDF viewer('Free Foxit Reader').
But, alas, my search for that Adobe Acrobat add-on showed it also unavailable for Macs.
One thing I did find, though this might be just out of my desperation to find anything at all that might be do-able (since this "GNU" PDF is crucial for me, as I depend upon the GIMP program it pertains to and have had no success in installing the contextual help itself and without being able to search this PDF, I am hopelessly lost!)
But it seems to me to be probably only an "update" to something that maybe was available at one time, as i cannot find an actual Adobe Reader app for Mac?
Does anyone have any ideas? What have i not tried or what am I not understanding?