This had me stumped but it’s not that tough. The persona website getpersonas.com tends to install personas without any permissions. But you can disable it by typing “about:config” in the Firefox address bar and remove any entry in the following property: lightweightThemes.usedThemes
There it is…you’ve now disabled personas!

These are the firefox URLs for different settings. Just paste them into the browser and bang, there you go:

chrome://pippki/content/getpassword.xul
chrome://pippki/content/PrefOverlay.xul
chrome://pippki/content/pref-ssl.xul
chrome://pippki/content/pref-certs.xul
chrome://pippki/content/pref-ciphers.xul
chrome://pippki/content/cipherinfo.xul
chrome://pippki/content/ssl2ciphers.xul
chrome://pippki/content/ssl3tlsciphers.xul
chrome://pippki/content/ssl3tlsciphers2.xul
chrome://pippki/content/PageInfoOverlay.xul
chrome://pippki/content/cacertexists.xul
chrome://pippki/content/CAOverlay.xul
chrome://pippki/content/WebSitesOverlay.xul
chrome://pippki/content/OthersOverlay.xul
chrome://pippki/content/MineOverlay.xul
chrome://pippki/content/viewCertDetails.xul
chrome://pippki/content/certpicker.xul
chrome://pippki/content/certDump.xul
chrome://pippki/content/load_device.xul
chrome://pippki/content/pref-validation.xul
chrome://pippki/content/pref-masterpass.xul
chrome://pippki/content/createCertInfo.xul
chrome://pippki/content/formsigning.xul
chrome://pippki/content/changepassword.xul
chrome://pippki/content/resetpassword.xul
chrome://pippki/content/newserver.xul
chrome://pippki/content/downloadcert.xul
chrome://pippki/content/certManager.xul
chrome://pippki/content/editcacert.xul
chrome://pippki/content/editemailcert.xul
chrome://pippki/content/editsslcert.xul
chrome://pippki/content/deletecert.xul
chrome://pippki/content/getp12password.xul
chrome://pippki/content/setp12password.xul
chrome://pippki/content/domainMismatch.xul
chrome://pippki/content/serverCertExpired.xul
chrome://pippki/content/clientauthask.xul
chrome://pippki/content/certViewer.xul
chrome://pippki/content/device_manager.xul
chrome://pippki/content/choosetoken.xul
chrome://pippki/content/escrowWarn.xul
chrome://pippki/content/crlManager.xul
chrome://pippki/content/serverCrlNextupdate.xul
chrome://pippki/content/crlImportDialog.xul
chrome://pippki/content/pref-crlupdate.xul
chrome://pippki/content/getpassword.xul
chrome://pippki/content/PrefOverlay.xul
chrome://pippki/content/pref-ssl.xul
chrome://pippki/content/pref-certs.xul
chrome://pippki/content/pref-ciphers.xul
chrome://pippki/content/cipherinfo.xul
chrome://pippki/content/ssl2ciphers.xul
chrome://pippki/content/ssl3tlsciphers.xul
chrome://pippki/content/ssl3tlsciphers2.xul
chrome://pippki/content/PageInfoOverlay.xul
chrome://pippki/content/cacertexists.xul
chrome://pippki/content/CAOverlay.xul
chrome://pippki/content/WebSitesOverlay.xul
chrome://pippki/content/OthersOverlay.xul
chrome://pippki/content/MineOverlay.xul
chrome://pippki/content/viewCertDetails.xul
chrome://pippki/content/certpicker.xul
chrome://pippki/content/certDump.xul
chrome://pippki/content/load_device.xul
chrome://pippki/content/pref-validation.xul
chrome://pippki/content/pref-masterpass.xul
chrome://pippki/content/createCertInfo.xul
chrome://pippki/content/formsigning.xul
chrome://pippki/content/changepassword.xul
chrome://pippki/content/resetpassword.xul
chrome://pippki/content/newserver.xul
chrome://pippki/content/downloadcert.xul
chrome://pippki/content/certManager.xul
chrome://pippki/content/editcacert.xul
chrome://pippki/content/editemailcert.xul
chrome://pippki/content/editsslcert.xul
chrome://pippki/content/deletecert.xul
chrome://pippki/content/getp12password.xul
chrome://pippki/content/setp12password.xul
chrome://pippki/content/domainMismatch.xul
chrome://pippki/content/serverCertExpired.xul
chrome://pippki/content/clientauthask.xul
chrome://pippki/content/certViewer.xul
chrome://pippki/content/device_manager.xul
chrome://pippki/content/choosetoken.xul
chrome://pippki/content/escrowWarn.xul
chrome://pippki/content/crlManager.xul
chrome://pippki/content/serverCrlNextupdate.xul
chrome://pippki/content/crlImportDialog.xul
chrome://pippki/content/pref-crlupdate.xul 

I love the site www.big-boys.com but in linux it would not play so I wanted to install a browser plugin that would play wmv files.
Here’s how I went about it. First I installed mplayer using yum (I use FC4 with kernel 2.6.13.2).
yum install mplayer
Make sure the internet connection is present when you run this command.

Then I went to Linux Plugins site to get the mplayerplugin. It redirected me to Mplayer Sourceforge site.

Then I downloaded the source of mplayerplug-in from Sourceforge download page for Mplayerplug-in.
Once I did that then came the main struggle of compiling and getting this to run.

I first untarred the file with command:

tar zxvf mplayerplug-in-3.11.tar.gz
cd mplayerplug-in
./configure –with-gecko-sdk=/usr/include/mozilla-1.7.8/
make

But this resulted in a bunch of errors.
I realized that an extra slash was put in there so I opened the Makefile with vim and removed the extra slash at the end of the string /usr/include/mozilla-1.7.8/ in the Makefile.
Tried to make again but again errors this time around some include files called prtypes.h was missing.

I noticed that in the CFLAGS section of the Makefile there was a space between -I and /usr/include. Deleted those.

So opened the Makefile in vim again and added the string -I/usr/include/mozilla-1.7.8/nspr/ to the CFLAGS section of the Makefile.

Also added -L/usr/lib/firefox-1.0.4/ to the LFLAGS section coz I was getting some linker errors after that. The struggle was not over.

I got a linker error :

/usr/bin/ld: cannot find -lxpcomglue
collect2: ld returned 1 exit status

Changed the -lxpcomglue in Makefile to -lxpcom.
Finally, the compilation and the build were successful. Then the final command
cp mplayerplug-in*.so /usr/lib/firefox-1.0.4/plugins/
And now I have mplayerplug-in live and kicking!

-Rajat.