Remove platform-dependent CSS and use browser titlebar on Firefox

[malisipi]

I removed platform-dependent CSS and used Firefox default titlebar support.

• Since Titlebar is handled by platform, titlebar is looking more consistent with system.
• Since removed platform-dependent CSS, should be fixed issues (like Firefox Issue #85) and code should be more future-proof.
• Untested on Windows and MacOS yet. If you test the PR on the platforms, can you share your test results.

TODO:

• Removed browser vendor name from titlebar. I need to run code on Browser Console (should not be confused with Web Console) and I can not find how to run via command-line.
• Manage title (until accessing browser console) and icon of browser with HWID of browser window, in Windows.

Tested on:

• Linux
• MacOS
• Windows

[hassandraga]

Windows:

[malisipi]

Actually if can we handle the browser window' HWID from PID in Windows, we can change title and browser logo by manually.
Potentially we can add a MutationObserver to handle title changes of page, and change it manually.

[hassandraga]

if can we handle the browser window' HWID from PID in Windows

We can't get the exact PID of the window as Firefox create many child process..., and Firefox may add - Mozilla Firefox to the title at any time anyway. It's just too much work for one browser.

Right now, your PR makes Firefox title-bar looks native, and it's way better than the actual userChrome.css style, We can deal with - Mozilla Firefox later...

I will test it on my Mac then it's ready to merge.

[hassandraga]

macOS:

[hassandraga]

Title issue in macOS is another issue to deal with later...

[hassandraga]

Thank you @malisipi for the PR.
You can verify, and merge when you want.

[malisipi]

Right now, your PR makes Firefox title-bar looks native, and it's way better than the actual userChrome.css style, We can deal with - Mozilla Firefox later...

You can verify, and merge when you want.

So, I will verify the PR. I will search solution for titlebar, I will create a new PR if I found a good solution. You can merge the PR.