The default setting of Google Chrome is "Not allow all add-ons to run when in secret mode".
However, you can also use the add-on in secret mode by changing the add-on settings.
In this article, I will explain in detail how to use the extension in secret mode.
This site is run by Japanese.
All the procedures explained on this site are compatible with Japanese Windows OS.
My translation and operational mistakes may have an unexpected negative effect on your computer.
Please use the site at your own risk.
I try to explain and translate as carefully as possible, but if there are any mistakes in my explanation or translation, please let me know in the comments.
What is "Secret Mode"?
Google Chrome has a secret mode function for browsing with almost no private information such as Internet browsing history, entered passwords, and cookies.

To open the secret mode, with Google Chrome in the active window, press "Ctrl" + "Shift" + "N" on the keyboard to open it.
If you want to know more about Google Chrome's secret mode, read here.
Change the settings to use add-ons while in Google Chrome secret mode from the add-on icon.

First of all, launch Google Chrome on your computer.
"Right-click" on the add-on you want to use while in secret mode.
Some add-on icons are displayed in the upper right corner of Google Chrome, while others are not.
If the add-on icon you want to use while in secret mode is not displayed in the upper right corner of Google Chrome, see "Change the settings to use add-ons while in Google Chrome secret mode from the add-on list.".
"Right-click" on the add-on icon to expand the menu downwards.
Click "Manage Add-ons" in it.

Click Manage Add-ons to go to the screen labeled "Add-ons".
Look for the item that says "Allow Add-ons in secret mode".
And click the switch to turn it on.
You need to scroll the screen a little.
If you no longer use this add-on in secret mode, click the switch to turn it off.

You can now use the add-on in secret mode.
Change the settings to use add-ons while in Google Chrome secret mode from the add-on list.

First of all, launch Google Chrome on your computer.
Click icon to go to the add-on management screen.
After clicking on it, the menu expands down.
Click "Manage Add-ons" in it.

Click "Properties" displayed in the add-on you want to use in secret mode.

Look for the item that says "Allow Add-ons in secret mode".
And click the switch to turn it on.
You need to scroll the screen a little.
If you no longer use this add-on in secret mode, click the switch to turn it off.

You can now use the add-on in secret mode.
Warning when using add-on in secret mode.
If the browsing history etc. is recorded by the add-on, the browsing history will remain even when browsing in secret mode.
Therefore, it should be kept in mind that if you enable add-ons in secret mode more and more, the merit of secret mode that it is difficult to keep a history of user operations and actions will be diminished.
I recommend that you enable only the minimum required add-ons.
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