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Well, I had Compact Menu before. I uninstalled it and installed Compact Menu 2. No Compact Menu icon appears. The standard menu is still present.
CM2 shows as enabled in Tools/Add-ons. Also shows as enabled when I look at Help/Troubleshooting Information. I've worked with this for quite a while. Manually deleting the Compact Menu folder in Extensions, reinstalling, still no good. I even uninstalled Firefox, reinstalled Firefox, and again installed CM2. Still nothing changes. Only the standard menu exists. Strange.

Questa recensione riguarda una versione precedente (3.1.1) del componente aggiuntivo. 

Compact Menu icon appear in the Toolbar customize dialog?