Hi,

The people who answer questions here, for the most part, are other Firefox users volunteering their time (like me), not Mozilla employees or Firefox developers.

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues.

You can use an extension to get Private Browsing mode support per tab.

• Private Tab: https://addons.mozilla.org/firefox/addon/private-tab/
• Private Browsing mode tabs get a dashed underline
• You can toggle Private Browsing mode off/on via the right-click context menu of a tab

Thank you both, I couldn't check both replies as Chosen Solution so that is why I checked the first. But both of you helped me much, suggestion posted in the provided link and add-on installed.

The Firefox devs usually leave it to extension developers to add features that aren't used extensively by a large audience. I'm using the extension for quite some years, so best is always to check if there is already an extension that adds a specific feature if you are missing it or ask on the forum.