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In addition to what I typed below, to get an icon to show up in firefox 4 & 5

Once extension downloaded to desktop, open .xpi file
Go to folder “chrome\duplicatethistab.jar\skin\modern\duplicatethistab\”
Extract file labelled "tab-drag-duplicate-indicator.png"
Edit in a suitable programme that can resize by pixels
Resize image to 48x48 pixel, & save as Icon.png
Resize ORIGINAL file to 64x64, & save as Icon64.png
Merge back into .xpi file & drag into firefox to install
Sourced with help from http://blog.mozilla.com/addons/2010/12/02/toolbar-buttons-in-firefox-4/

此意見為舊版本 (1.2.1-signed.1-signed) 的附加元件。  對於這個附加元件,此使用者的其他意見