In Firefox, though we have set master-password, it is possible to view the saved passwords through show passwords.Think if, that button itself disabled.
After surfing the net, i got a solution
1) Add the following 2 lines of code in a file named mozilla.txt
//
lockPref("pref.privacy.disable_button.view_passwords", true);
Note: This is an example, which helps to lockdown show-password. You can find more options by browsing the "about:config" page
2) Now this has to be encoded. Here is the online encoder (Byteshift 13). Save it as mozilla.cfg
3) Edit the file "Mozilla Firefox\greprefs\all.js" by adding the following to the end of it:
pref("general.config.filename", "mozilla.cfg");
$ locate all.js
/usr/share/firefox/greprefs/all.js
/usr/share/firefox/greprefs/xpinstall.js
$ echo "pref(\"general.config.filename\", \"mozilla.cfg\");" >>
/usr/share/firefox/greprefs/all.js
4) Copy the new file "mozilla.cfg" to Mozilla Firefox directory:
eg : cp mozilla.cfg /usr/lib/firefox
Here you can see the "Show passwords" disabled. Also if you browse for "about:config"
Reference : Locking Firefox Settings
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