Hi, I've been using Roboform for years, and sometimes struggled to find an xpi file to use to add the toolbar to a browser. Suddenly I came across a way so simple I couldn't believe my eyes- drag 'n drop.

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Taken from text by Roboform support, and adapted for Roboform v8.3.5.5
Open the browser;
- click RoboForm's taskbar icon > Options > Browser and apps
- on the Browser Integration screen, click Chromium and Chormium-based browsers or Firefox-based browsers as appropriate: a box will pop up;
- drag the small icon in that box and drop it onto the browser window;
- you will be prompted if you'd like to add the new add-on, please confirm.

That causes the appropriate xpi file to be installed as an add-on.

Note: Pale Moon is a Firefox derivative, and, like Waterfox, still supports the long Roboform toolbar, provided you are using a version of Roboform that still supports it.