= Firefox =
Mozilla Firefox is a free and open-source web browser developed for Windows, OS X, and Linux, with a mobile version for Android, by the Mozilla Foundation.

== Activate built-in PDF viewer ==

Write '''about:config''' on the browser URL textbox, click on '''"I'll be careful, I promise"'''.

Look for the property '''browser.preferences.inContent''' and set it as true.

Look for the property '''pdfjs.disabled''' and set it as false.

Click on the '''Edit menu''', '''Preferences''', '''Applications''', '''Portable Document Format''' and set it as '''Preview in Firefox'''.

Restart Firefox

== Firefox ESR (Extended Support Release) in Slackware64 14 ==
 * cd /opt
 * wget http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/latest-esr/linux-x86_64/en-US/firefox-31.3.0esr.tar.bz2
 * tar xvif firefox-31.3.0esr.tar.bz2 
 * mv firefox/ firefox-31.3.0esr
 * ln -s firefox-31.3.0esr firefox