打开火狐。 点击☰。 点击库。 点击历史。 Click 清除最近的历史记录…。 点击“清除时间范围”下拉框。 点击全部。 选中“表单和搜索历史”勾选框。 点击立即清除。

Given the above summary, write a detailed text in English for it.
Click or double-click the Firefox app icon, which resembles an orange fox on a blue globe. It's in the top-right corner of the Firefox window. A drop-down menu will appear. This option is near the top of the drop-down menu. It's near the top of the menu. This is near the top of the menu. Doing so opens a pop-up window. It's at the top of the pop-up window. Clicking it prompts a drop-down menu. You'll find this at the bottom of the drop-down menu. It's in the middle of the pop-up window.  You can uncheck every other box in this form, but the "Form & Search History" box must be checked. If this box is already checked, skip this step. This is at the bottom of the pop-up window. Doing so will clear your computer's Firefox search box history.