@tomaharizanov It's an extension, so first go to the menu on the upper left of your browser window by clicking the red O and scrolling down to "Extensions" and click "Get Extensions." Second, enter V7 Notes in the search bar of the extension marketplace. Third, download the extension and enable it in your extension manager.
NOTE: I believe that V7 Notes operates on the sidebar, not in the bookmarks bar, so you might have already downloaded and enabled it. Scroll to the left side of the browser to unhide the sidebar and scroll down toward the bottom to find it.

Re: Cant sign into my Gmail through opera

I'm having this problem, too. I can't log into any of my Google accounts--Organizational (enterprise) and Personal (free)--nor can I access Drive, Sites, Voice, Contacts, or anything except for YouTube. I can't access other services through the YouTube portal. Error message that the server is "malformed":

400. That’s an error.
The server cannot process the request because it is malformed. It should not be retried. That’s all we know.

Problem has persisted for two days across devices, in private windows, before and after syncing, logged in and logged out, and after clearing cookies.

Brave and Firefox browsers work just fine. This is an Opera problem.

@newworldman Plugins can access and collect data, regardless of whether they are disabled or not, and regardless of whether I use them or not. This is a basic Privacy Best Practice.

Remove Facebook, Whatsapp, Telegram, VK, Twitter, and Instagram from the browser. If people want to add them as an extension, then enable that function, but this built-in function is a cybersecurity worst practice and a privacy worst practice.

Please make this add-on for the Brave browser! I use V7 Notes all day, every day. I can deal without syncing and basic editing tools, but Please don't refuse my move to Brave.

A website that I use frequently (https://www.nationalacademies.org) will only open in Incognito. I have updated the browser, cleared the cache for all time, and added the site to Accept All Cookies, Pop-ups, Redirects, etc in Settings. Still, whenever I link to the site, enter it into the address bar, or try to open it from Favorites, a tab with the site's name will launch, but the content itself will not load. However, there is no problem doing the same in Incognito.

After a few months of this, I am now in the habit of opening Nasem pages in Incognito, but I'd like to understand what is going on.

@sgunhouse Wrong. I don't even have a Facebook account, and I'm looking at the Messenger Icon in my sidebar Right Now.

@trippap Messenger, WhatsApp, Instagram, and Telegram will continue to pop up in the sidebar, even after they have been disabled and Opera's settings have been optimized for privacy. Opera is now owned by a Chinese company, so it's no longer a good choice for privacy protectionists. Despite the inconvenience, you should switch to Firefox if you don't want your data to be stolen and monetized by somebody else.