Solved!
thx

The Tabs menu keyboard shortcut conflicts with an extension.

Is there any way to change or disable the key?

thx

These steps don't work:
https://productforums.google.com/forum/#!topic/chrome/e7fhdYPtWjE

on restart Opera, devtools are still enabled.

Any fix?

Linux 4.15.0-29-generic #31-Ubuntu SMP , x86_64 x86_64 x86_64 GNU/Linux

note, Shift opens in a new window.
Control opens in a new tab.
Any way to make "new tab" the default?

more info on Disks application:

https://wiki.gnome.org/Apps/Disks

requires that you can run gnome software,

Thx.

Any way to make new-tab the default?

UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36 OPR/54.0.2952.64

Chrome version: 67.0.3396.87 Channel: stable
OS Version: 4.15.0-29-generic #31-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux
Flash Version: not installed

Steps to reproduce the problem:

1. Install the Opera extension "Install Chrome Extensions" https://addons.opera.com/en/extensions/details/install-chrome-extensions/
2. Install some Chrome and Opera extensions.
3. Launch Opera-Chromium browser with --single-process
4. After a few minutes of browsing on multiple tabs, click an extension button.

What is the expected behavior?
Extension popup will open.

What went wrong?
Opera-Chromium crashes

Crashed report ID in about://crashes: Not available in Opera-Chromium

How much crashed? Whole browser

Did this work before? No

no probs if remove --single-process switch

Reported to Google here:
https://bugs.chromium.org/p/chromium/issues/detail?id=871431

When i right-click on a url, and pick "Go to web address", it opens in the current tab.

How to make it open in a new tab?

My Mint 19 xfce doesn't give write-access external partitions by default. This fix will give your Linux write-access.

This fix assumes you already have read-only access to the external partition. If you already have read-access to the drive, then your Linux has no problem with the partition format, whether NTFS, FAT32, or something else. Setting Linux-style permissions (chmod) on the external drive won't work if the drive is NTFS.

Caution: Non-advanced users should not mount their Windows operating system disk in Linux-- you can break your Windows if you accidentally alter a Windows system file. In my case, the external ntfs partition i'm mounting in Linux is not my Windows operating system disk-- it's just my document storage.

The fix is:

• disable fast-boot in Windows, and do a full Windows shutdown (rather than "Restart")
  https://itsfoss.com/solve-ntfs-mount-problem-ubuntu-windows-8-dual-boot/
• tell Linux that the current user is "owner" of the drive, by appending their uid to the drive's mount-options. (this will be in-effect only while Linux is booted, and will not affect your Windows):
  • In Linux, open a terminal, and enter id
  • Copy the uid. On my Linux, it's:
    uid=1000
  • Open Disks program.
  • In the left pane, pick the drive containing the external partition.
  • In right pane, click the desired partition.
  • Click the gear button, and pick Edit mount options
  • Find the textbox above the "Mount Point" box. Type a comma at the end of the text already there. Then paste. Don't alter anything that's already there. My final line looks like:
    nosuid,nodev,nofail,x-gvfs-show,uid=1000
  • Reboot Linux.
  • Done.for when

This will give write-access to only the current Linux user (and no other Linux users). If you want to give access to all users in the same user-group as the current user, then instead of entering the uid from the terminal-command above, enter the gid. Eg:
gid=1000

If you don't have the Disks program, you have to directly edit a system configuration file, called fstab. Fstab file is found at: /etc/fstab. But again, if your Linux already has read-access to the drive, then you don't have to worry about the myriad of fstab options-- just append your uid or gid to the current fstab settings for that partition. More info:
www.linuxstall.com/fstab/

@leocg i think it's more accurate to say,
"clear the find box on the 2nd tab before pressing F3"

it doesn't matter if the 2nd tab's search field is open, for F3 to work. The search field on the 2nd tab can be open-- F3 will repeat the search from the first tab.

But only if the search field on the 2nd tab is empty.

Solved.

thx