Start second Firefox with profile manager:

"C:\Programme\Mozilla Firefox\firefox.exe" -no-remote -ProfileManager

Old versions of firefox seem to need:

SET MOZ_NO_REMOTE=1
"C:\Programme\Mozilla Firefox\firefox.exe" -ProfileManager

Windows

about.config:

  browser.gesture.pince.in — Value = cmd_fullZoomReduce
  browser.gesture.pinch.in.shift — Value = cmd_fullZoomReset
  browser.gesture.pinch.latched — Value = false
  browser.gesture.pinch.out — Value = cmd_fullZoomEnlarge
  browser.gesture.pinch.out.shift — Value = cmd_fullZoomReset
  browser.gesture.pinch.threshold — Value = 40 to 100 (set it to a number that works for you)

References:

• Enabling Pinch Zoom Trackpad Gestures in Firefox

OSX

This ist outdated on current versions of firefox, use extension Classic theme restorer instead

To put the tabs bar again down in recent versions of firefox without the respective menu item:

1. Open location “about:config”
2. Search for “browser.tabs.onTop”
3. Toggle to “false” (by doubleclick)

Have fun!

References:

Firefox Tabs wieder unter die Adressleiste

about:config:

browser.urlbar.trimURLs = false

about:config:

browser.fixup.alternate.enabled = false

References:

https://support.mozilla.org/de/kb/suche-ueber-die-adressleiste?redirectlocale=en-US&redirectslug=Location+bar+search#w_url-autovervollstacndigung

I just encountered the (in)famous “The PKCS 12 operation failed for unknown reasons.” error message while trying to import a personal PKCS#12 certificate and key into firefox 43 or firefox 45 on ubuntu.

As the the import worked on a different firefox profile by the same user account on the same machine as expected, I concluded that the certificat file was okay, but I had some runtime or configuration issue within firefox.

While neither finding helpfull information on the web nor some means to do analytic troubleshooting, I just started to try out things.

In the end, it turned out that starting firefox without my previously opened tabs allowed me to import the certificate in question.

So some of my opened tabs did prevent installing a personal certificat into firefox … - WTF???

Cert

Firefox