sudo cp -i –reply=no ~/.mozilla.ubuntu/firefox/t6xiz584.default/search/* /opt/firefox/searchplugins/

The random number t6xiz584 will change according to your firefox profile. It varies according to your system.
And I have tried to format the code as nicely as possible. I am also trying to design a nicer theme for the blog.

In this section… Restore your search plugins

sudo cp -i –reply=no ~/.mozilla/firefox/*.default/search/* /opt/firefox/searchplugins/

i have used this line…
sudo cp -i --reply=no ~/.mozilla.ubuntu/firefox/t6xiz584.default/search/* /opt/firefox/searchplugins/

cd ~/.mozilla/firefox/*.defaultmkdir ~/Desktop/ffsettingscp bookmarks.html cert8.db
cookies.txt formhistory.dat key3.db signons.txt history.dat mimeTypes.rdf ~/Desktop/ffsettings

for this…
$ mkdir ~/Desktop/ffsettingscp
$ cd ~/.mozilla/firefox/*.default
$ cp bookmarks.html cert8.db cookies.txt formhistory.dat \
key3.db signons.txt history.dat mimeTypes.rdf ~/Desktop/ffsettings