When we update the DealPOS version to add new features or fix bugs, there is sometimes a cache issue in the browser that causes minor issues. It may be fixed by clearing the cache on the browser you're using, In this article, we'll show you how to do it on Mozilla Firefox:
I. Using Alternative Button
Step 1. Press button Ctrl + Shift + Del
Time range to clear "everything", and "Clear Now"

II. Using Firefox Interface
Step 1. Click the button on the right top side panel Mozzila, and choose "Options".

Step 2. Select Privacy & Security - Cookies and Site Data - Clear data

Step 3. Tick as this image below "Clear"

III. Refresh Firefox
Step 1. Click the button on the right top side panel Mozzila, click the button "Help", and click "troubleshooting information"


Step 2. Click refresh Firefox, and click Finish

Note: if you use step 2, your setup printer margin will be back to default. If you want setup it back, you can click menu - print - and follow this

Video For Sell Page Error When Open In Mozilla Firefox (Clear Cache)
You might also like to read this article:
If you have a similar problem (cache issue) in the Mozilla browser, follow the steps in this article: Clear Browsing History on Google Chrome.
If you have a similar problem (cache issue) in the Safari browser, follow the steps in this article: Clear Browsing history on Safari.
If the CSV file you open from the Export results has disorganized data, it's probably because the Region settings are misconfigured, to resolve this issue, go see this article: How to Solve Bad Format in CSV File (Windows OS).