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The following text has shown you some brilliant methods.
Firefox your connection is not secure error fixed.
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This article includes 5 tips for how to solve your connection is not secure error on Mozilla Firefox.
Therefore, you’re gonna wanna remove the problematic Windows update.
Step 2: Go to theWindows Updatetab, and then clickView update history.

Step 3: ClickUninstall updates, and then you might see the recent update on the list.
Click it and then chooseUninstall.
Reportedly, now Windows 10 can automatically uninstall botched Windows update that causes stability issues for you.

Read this post to learn more.
Step 2: Check your time and date.
Step 3: Set your time and date, then clickChangeto back up your changes.
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Now you’ve got the option to verify if the website security certificate error still persists.
Thus, it’s crucial that you disable it to get rid of the error.
Step 2: SetView by: Small icons, and then clickInternet Options.

Step 3: Go to theAdvancedtab, and then locate theSecuritysection.
Find theWarn about certificate address mismatchoption and uncheck the box next to it.
ClickApplyandOKto stash your changes.

Step 4: cycle your rig to find out if the website security certificate error is gone.