Find PDF in the list and change it to the desired value.In the General panel, go down to the Applications section.Alternatively, enter about:preferences in the address bar. Older versions of Firefox stored Downloads in a separate. Click the hamburger menu button and choose “Preferences”. Firefox history is mainly stored within SQLite databases located in the Firefox profile folder.

Here is how to disable the built-in PDF viewer or use the system viewer: Here is an example of what the About Firefox window. The version number is listed underneath the Firefox name. The built-in PDF viewer in Firefox has progressed continuously since its introduction in 2013, but I still prefer using the distribution’s document viewer (Evince/Xreader/…). Click the menu button, click Help and select About Firefox.On the menu bar, click the Firefox menu and select About Firefox.

Disable the built-in PDF reader in Firefox mousewheel.system_scroll_override_on_root_Ģ.

There are a few more variables which influence the vertical scrolling speed and can be changed safely, for example: The acceleration computations create a constant acceleration effect, but this value can control the level of acceleration. : The multiplicative factor used to determine the rate of acceleration.Suggested values: 2 (accelerations kicks in really fast) to 5. This value determines whether or not acceleration computations are applied to a given scroll event. : The mouse wheel “click” number at which acceleration begins to take effect.It's all terminal commands so I assume if it's not going to work on 14.04, a bad command error will let me/you know. I tried again and just moved faster on it and got the box unchecked before it could start the upgrade and it worked. If you don't get to it fast enough, I couldn't figure out how to interupt the download and installation. Almost immediately after the older version starts up, it will likely automatically update to the newest version! As soon as you start up the older version, you have to go to Edit > Preferences > Advanced button > Update tab.Īnd uncheck the 'automatically download newest version' box. I don't see why it wouldn't work for 14.04. So I'm getting ready to try this with 14.04. Now that I've upgraded my Ubuntu to 14.04, Firefox 31.0 is dragging like crazy.very slow and unresponsive.

Here are some clear instructions for downgrading to an older version of Firefox in Ubuntu 12.04.

How to get older versions of firefox