You can try the following steps to fix the matter.
You should close the Firefox if it is already opened.
Now browse to the Scroll App. It was installed at C:\Program Files\Logitech\Scroll App in my machine.
After that you have to browse for the Firefox extension content script and it will be under
C:\Program Files\Logitech\Scroll App/LogiSmoothFirefoxExt\chrome\content/overlay.js.
Now you have to launch that particular folder into the notepad and uncomment the below mentioned lines.
Code:
/*
gBrowser.tabContainer.addEventListener("TabOpen", function () { logismoothscrollext.onTabOpened(); }, false);
gBrowser.tabContainer.addEventListener("TabMove", function () { logismoothscrollext.onTabMoved(); }, false);
gBrowser.tabContainer.addEventListener("TabClose", function () { logismoothscrollext.onTabClosed(); }, false);
gBrowser.tabContainer.addEventListener("TabSelect", function () { logismoothscrollext.onTabSelected(); }, false);
*/
Now restart the browser.
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