I want to add automatic ie tab in firefox without adding manual setting,also i want to change value of extensions.ietab.filterlist without going on about:config

Question

1)I wants to change default extensions.ietab.filterlist value to mywebsite url without going to follow many steps,whenever user will hit my site then for users browser extensions.ietab.filterlist value should be added when he will hit my site.About:config we can add manually but i don't wants to add manually ,any way to automate this process,
2)Is there any way to install activex (Ietab extension) without clicking on add in firefox,,i am asking because my site is not supported to firefox due to activex.
3)How we add admin privilages for activex in firefox.
. please help me

Answer 1

I got solution for this problem,
1) I have added User.js file in default profile folder of mozilla i.e
C:\Users\xpointers\AppData\Roaming\Mozilla\Firefox\Profiles\xb2fxdxi.default, I have added in user.js
user_pref("extensions.ietab2.filterlist", "/^file:\\/\\/\\/.*\\.(mht|mhtml)$/ http://*update.microsoft.com/* http://www.windowsupdate.com/* http://www.UrWebsiteUrl.com/* ");
You can add n number of url for running In IETAb or IEtab2.
User.js file overwrites prefs.js file .
2) for adding extensions automatically need to add addon, using code and need to change extensions.json file for new version of firefox ,for older version of firefox need to change in sqlite database.