This extension lets you highlight all occurrences of a word just by selecting it ( there is no button in the toolbar) There are two modes: - native mode: the add-on uses Firefox built-in highlighting feature (not customizable) - custom mode: the add-on makes use of a third-party library to highlight text. More options are available, such as multiple color highlighting and display of search markers
![HighlightAll – 🦊 Firefox (ja) 向け拡張機能を入手](https://cdn-ak-scissors.b.st-hatena.com/image/square/22736739ca015e9167379111c42ef8c6bc277b38/height=288;version=1;width=512/https%3A%2F%2Faddons.mozilla.org%2Fuser-media%2Fpreviews%2Ffull%2F248%2F248146.png%3Fmodified%3D1622132522)