@jimunderscorep Thanks a lot for the answer.
It's kinda strange that Opera, a Chromium spin, would have that behavior while Vivaldi and Brave, also Chromium spins, would not, not to mention Chromium itself.
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Opera opens in a smaller size, smaller than the screen. I've recently installed a number of browsers to test them -- Opera, Vivaldi, Otter, and Brave, all on Linux Mint -- but none of the others have this behavior. I removed the four extensions I was using, but that had no effect. There must be a setting that controls this, but I cannot find it.
@kitwar Maybe, but I doubt it, given that I have blocked third-party cookies, chose settings to delete all cookies and history when I close the browser, and installed uBlock Origin, HTTPS Everywhere, and Privacy Badger. I just checked my cookies and the only ones present are from this session. It's probably fingerprinting, given that I do not listen to popular music and my DSL ISP gives IP addresses within a narrow range.
@leocg Thanks for the reply. I read that, but it doesn't specifically address my issue. As I said before, Linux Mint states in its release notes that Ubuntu telemetry is disabled, with Linux Mint being a spin of Ubuntu. Similarly, Opera is a Chromium spin. That Reddit thread I referenced includes the assertions of a few people who claimed that Chromium phones home to Google every time it is opened and also every now and then to verify if Chrome extensions are current. The IP address is passed along, at a minimum.
Also, it would seem that if a user installs "Install Chrome Extensions," then regular communication with Google would be conducted. though there is a simple fix for that: don't install it or Chrome extensions.
I never use Google search. I use a variety of browsers, including Opera and Firefox, but never Chrome. I never surf while being logged into any website. But Google still remembers my old searches on Youtube even though I never use it while logged in.
Reddit users noted that Chromium checks in with Google's mothership, thought it's unknown what data is communicated other than the IP address. Opera is based on Chromium, but just as Linux Mint disabled Ubuntu's telemetry, it could have disabled Google's data-mining. What does Opera do in this respect?
For a few versions of Opera I have been unable to find the update button. I cannot see it in Settings or anywhere else. I have multiple PCs and the ones with 35 claim in About Opera that it is up to date, but of course that's not true now. It's probably some obscure shortcut, e.g. Shift-Alt-hittheroadjack. So far I have uninstalled the old software and installed the new, but that's gotten old. Please tell how to find the update button.
Here are the details:
Error: INVALID:opera-stable-35.0.2066.92-0.x86_64 (file-e30efb8b): Signature verification failed [4-Signatures public key is not available]
Header V4 RSA/SHA1 Signature, key ID f6d61d45: NOKEY
Header SHA1 digest: OK (64a505fa958cf3d7705b158b4febc24f4320da89)
V4 RSA/SHA1 Signature, key ID f6d61d45: NOKEY
MD5 digest: OK (3af9cc239f54517c7cf99e40a670714c)
It appears to be a public key issue with Opera.
I'm playing with openSUSE. I just built a new system of Leap 42.1. Then I downloaded the RPM version of Opera and tried to install it, but I got the message: "Package opera-stable is broken, integrity check has failed." The hardware is Intel, only five years old. Any ideas?