The visibility of the top title bar is a feature of windows manager of a linux distro. F11 key opens current page in full screen. All open tabs disappear in this way. Maximized key in launcher doesn't resolve this problem. I have top bar in Linux Mint 18.3 Cinamon too. In xUbuntu there is no top bar by default. But you can enable it in windows manager tweaks in the system settings.

Yesterday, I noticed that nearly five new bookmarks appeared in Speed Dial. That were Google, Yandex, Booking. I don't want to see them in my Speed Dial. I think that it is not a good behavior of browser.

@jadesword
I'm using Linux Mint Cinnamon 18.3 with latest Opera stable. I have no problems with VPN. It works fine.

Hello! I installed last official version of Opera from Google Play. My device is HTC One M7 with HTC stock firmware based on Android 5.0.2. I noticed that Opera drains my battery too much. In the Power - Battery Usage - Screen Off on my device I can see that Opera uses nearly 50% while the screen is off. I don't set synchronization to my Opera account. I only have two tabs open. I think it's not a good thing.

As I expected the problem was in synchronization again. I synchronized only bookmarks and passwords. As a result I have flash and passwords problem. So I had to reset Opera again, then restart system. After that everything works as it must do.

Hello! I noticed that Opera 51.0.2830.34 on Linux Mint 18.3 (x86_64; X-Cinnamon) doesn't save any passwords. When I enter my password for some site the dialog box appears on the top of the page asking me to save password. I press "Save". Everything seems alright. Then close Opera, then open, and visit this site again. I see my login and password marked as ****, I press enter, and Opera asks me again to save password. The list of saved passwords in Opera settings is empty. May be the problem with synchronization again?

@cybrsaylr said in Linux Mint Adobe Flash:

What's funny is I have a couple old laptops running Ubuntu 12.04 and 14.04, that still have Opera 42.0 and Flash and videos all play fine!

Do you have synchronization of your new Opera 51 with this machines enabled? I mean the Opera account. I've said already that when I enabled synchronization in Opera 51 with my account, Flash stoped working. The only thing I have to do is to reset Opera settings. After that flash is working fine. That settings were made with Opera 45 on xubuntu 32-bit.

@tomiki You are wrong. You can visit Adobe website and download flash for any browser for Linux.

Hello. I'm using Linux Mint 18.3 (x86_64; X-Cinnamon). Is there any way to change Opera icon in Menu and panel standard view? I can change it for shortcut on desktop, but not for item in Main menu. Now icon looks like white O in a red square. I like to use simple red O with transparent background.
When i try to change it in menu editor it doesn't save any changes. I even change size of icon. There is no effect. Linux Mint menu uses it's own icon. I can't understand where it takes it from.

I think, I've sold it. I reset the browser settings to default. After that flash is working fine. I found that the problem was in synchronization with Opera account. This account was made on Xubuntu 32-bit and Opera 45. After synchronization Adobe Flash stops working on my Opera 51 Linux Mint 64-bit.