When initialization, the extension tries to automatically detect whether menubar is visible, if true, the extension will hide three buttons ( Minimize, Maximize/Restore and Close buttons )on navigate-bar, otherwise, these three buttons will be displayed on navigate-bar. If menu-bar was hidden by other add-ons, or "Hide Caption" can't detect them correctly, you can force to show these three buttons
![Hide Caption – Get this Extension for 🦊 Firefox (ja)](https://cdn-ak-scissors.b.st-hatena.com/image/square/c90c5f340d8aa845809793e23d9d2e6712700b1c/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F26%2F26725.png%3Fmodified%3D1530208445)