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Hello Richard,
First, let me apologize to you for not mentioning in my original post that after I moved my default browser from iceweasel to firefox-esr, and deleted from my Wheezy computer iceweasel, I made both the changes you mentioned in your first post to me. If I had done so you would not have been put to the trouble of explaining them to me.
Running the command in your second post as my user, "kwriteconfig - --file kdeglobals --group General --key 'BrowserApplication' '!firefox-esr'" -- all on one line of course without the double quotes - -- seemed to be accepted by the computer. Since I too do not know the dcop signal to reload the config, I simply rebooted the computer. I found that it did work. Thank you for your providing me with that solution.
Between the time of my original post and of your answers I thought of another solution, simply create in /usr/bin the following link "ln -s firefox-esr iceweasel". That solution also worked; but your solution is better; so I reverted to it once I knew it would work -- although with an incomplete understanding of how or why!
Regards, Ken Heard