Some of the extensions' icons DO NOT WANT TO MOVE
I didn't have this problem before but it just somehow started. Now I cannot move some icons of addons I've been using for weeks that I never had this kind of problem with. The extensions that are having the problem at moment and NEVER HAD it before are Lastpass, Lazarus and Xmarks. I took Lastpass as an example and tried disabling ALL the other addons and yet nothing changed and there is how the icon looks like when I press customize ( http://www.mediafire.com/convkey/6af1/dsxwzmhqfis7maafg.jpg?size_id=7 ) and when I try to drag it it shows the blocking icon. I also tried to re-install the addon.
Opaite Mbohovái (6)
You may need to delete the localstore.rdf file in the profile folder.
Are the involved icons all positioned on the Add-ons bar or on other toolbars as well?
Only on the addons bar (Down)
Icons placed on the Add-ons bar are less likely to be customizable then the ones placed on other toolbars.
Some extensions have a setting in their options to set where to place the icon, so you can check on the about:addons page (Firefox/Tools > Add-ons > Extensions) to see if you can position the icon on other toolbars.
Problem not fixed. Please Help.
You are the one who abandoned this thread almost 2 months ago.
Have you tried the Options settings for those extensions as cor-el mentioned in his last posting?
Have you tried LastPass support, for help with their product?
https://lastpass.com/support.php