How to solve the problem that the scroll bar of synaptics touchpad cannot be used in firefox2.0

My original version is acer5022wlmis. After throwing it to Firefox, I found that the scroll bar on the touchpad was not working. However, after Firefox switched to the IE kernel, the scroll bar was quite good...
After searching for Baidu for half a day, I did not find any available solutions. Then I went to Google to search again.
However, Baidu and Google's search results all mention updating the driver on the official synaptics website. Program,
Quote

Important
The synaptics device driver is customized to meet the specific
Requirements of your device manufacturer. To ensure that you get
Appropriate Device Driver for your system, download your synaptics
Device Driver from your system
Manufacturer's support website.

General idea

Synaptics device drivers are used to meet the specific requirements of your device manufacturer. To ensure that you get the appropriate device driver, go to your system manufacturer support website to download the synaptics device driver.

No matter whether the driver for XP is downloaded in 3721, if the driver is not uninstalled, update the driver and the installer prompts you to restart the computer.
After the restart, check the driver and no changes are found. However, the scroll bar can be used in Firefox.
All of the above are experiences. I hope you can help me.