Hi quapurna, Currently there is not a feature to specify a folder by default for specific file types. However, there is a feature to change the file path but its not visible.

browser.download.dir was the desktop feature, but this is not seen in Android. 

There is a cross hack http://forum.xda-developers.com/galax.../tool-directorybind-data-to-externalsd-t1410262

That's all I have.

Firefox Android developers. Please, provide an option to select the default folder for saving files (image, save as pdf, etc) in the internal and/or external storage media. Thanks.

Found the existing bug, please follow this bug for future updates on this feature :-) https://bugzilla.mozilla.org/show_bug.cgi?id=677001

Thanks, guigs2. I have voted for that bug.

Actually, I have done the 'trick' written by jscher2000: https://support.mozilla.org/en-US/questions/978679#answer-505258

Now, FF will save image on the folder I set. The addon "Fennec Screenshot 0.1.4" also uses that folder now. However, FF "save as pdf" feature does not use the folder I set.

Thanks.