HowTo: https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer

Homepage New Tab - New Tab Home Page

https://addons.mozilla.org/en-US/firefox/addon/homepage-new-tab

DownThemAll - Download Manager

https://addons.mozilla.org/en-US/firefox/addon/downthemall

FlashBlock - Block Annoying Flash Ads

https://addons.mozilla.org/en-US/firefox/addon/flashblock

LastPass - Password Manager

https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager

FireFTP - Low-Overhead FTP Client and a Button for the Tool Bar

https://addons.mozilla.org/en-US/firefox/addon/fireftp

https://addons.mozilla.org/en-US/firefox/addon/fireftp-button

Firebug - HTML Troubleshooting

https://addons.mozilla.org/en-US/firefox/addon/firebug

Disable Use hardware acceleration when available for a user:

Firefox → Options → Advanced → deselect the option Use hardware acceleration when available

--disable-gpu

This is very important for RDS servers.

// place this file, including comments, in the installation directory with firefox.exe

// Smooth Scrolling Disabled
lockPref("general.smoothScroll", false);

// Disable GPU hardware accelleration
lockPref ("gfx.direct2d.disabled", true);
lockPref ("layers.acceleration.disabled", true);

// place this file in the defaults/pref subfolder of the installation directory
pref("general.config.obscure_value", 0);
pref("general.config.filename", "mozilla.cfg");