Firefox browser non autoupdate and other settings

1. enter about:config in url bar

2. No auto updating:

   app.update.auto = false

   app.update.enabled = false

3. No crash report and resuming:

   browser.sessionstore.resume_from_crash = false

   browser.tabs.crashReporting.sendReport = false

4. Per bug 1328949, we should add

   javascript.options.asyncstack=false

   browser.urlbar.oneOffSearches=false (Nightly default on, might not be necessary)

   findbar.highlightAll=false (Nightly default on, might not be necessary)

   findbar.modalHighlight=false (Nightly default on, might not be necessary)

5. Disable Flash

   user_pref("plugin.state.flash", 0);

6. Disable Default Browser checking

   user_pref("browser.shell.checkDefaultBrowser", false);