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.

But is there a way to create a way for user to vote/agree with a selected issue. Hence I want the preference back and so do <#> of users while <#> do not.

If you tell us what you want to change, we can suggest a setting or an add-on to fix it.

hi, firefox won't bring back the old options interface - the browser.preferences.inContent preference was just in place temporarily for a transitional period. now that there were new features and settings going into preferences and old windowed interface was no longer maintained, its users would have missed out on them, so the support has been totally dropped in firefox 42.

if you still miss the old styling - the classic theme restorer addon from https://addons.mozilla.org/firefox/addon/classicthemerestorer/ contains some tweaks to make the options-styling more familiar or to open it in a window...

Classic Theme Restorer does not have this feature I know this cause I have it. I want to know where do I go to vote against intab menus. Is there any kind of voting at all?

You can find here in the Classic Theme Restorer extension:

• General UI (1): Open options page (about:preferences) in a window

If that isn't working or the choice is missing then you might be using a theme that isn't supported. You can check that by switching to the default theme.

Which version of classic theme restorer are you using? Is it one of the beta versions?

Installed latest beta version and the option appeared. Noticed that the theme FT DeepDark doesn't worth with preference so I have email both add-on developers of the issue. Thanks to Cor-el