How do I keep the add-on FLOAT NOTES from disappearing from the context menu and is therefore not available for use

When I go online, the addon FLOAT NOTES shows up in the right click context menu. I go to a web site and it will show up the first time I right click. After that it no longer shows up on the right click context menu, until I restart Firefox, and then the same exact thing recurs. I am using Yahoo as my home page and search engine etc..

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