Copy from.... https://puppyxfcefusilli.wordpress.com/ ... opera-104/ 
n.b.- Some people prefer firefox or chrome because they have got more addons...... WITH OPERA 104 that reason will dissappears...
Opera 104 introduces the capability to install Chrome extensions directly. Users can now easily add Chrome extensions to their Opera browser, expanding the range of available features and functionalities[2]. To install a Chrome extension in Opera:
Find the desired Chrome extension on the Chrome Web Store.
Click the 'Add to Opera' button.
Confirm the installation by clicking 'Install'[5].
This update enhances tab management convenience and resolves issues related to accessing the close button[2].
Sources
forums.opera.com - [Solved]Install Chrome Extensions Is Missing
blogs.opera.com - Opera 104.0.4944.36 Stable update
forums.opera.com - Install Chrome Extensions
forums.opera.com - Install Chrome Extensions
reddit.com - Is there any way to import chrome extensions to opera gx?
xataka.com - Cómo instalar las extensiones de Chrome en Opera
My opera ADDONS:
There could be less addonss than in FF or Chrome, but what I used, are amazing.... FOR NOW.
1.-DISCONNECT
Disconnect lets you visualize and block the invisible websites that track you. Load the pages you go to 44% faster. Stop tracking by thousands of third-party sites.
Disconnect was named the best privacy tool by the New York Times (2016), Innovation Award winner for Best Privacy and Security software at South by Southwest (2015), listed as one of the 100 best innovations of the year by Popular Science and one of the 20 best Chrome extensions by Lifehacker.
Disconnect is open-source <http://git.io/Do5OtA>, pay-what-you-want software <https://disconnect.me/support>.
You can get help on our site <https://disconnect.me/disconnect/help>.
Note: Green (or checked) means blocked!
Note: Disconnect is only available for Opera 15 and up! For help, visit https://disconnect.me/help.
2.- LASTPASS
LastPass puts you in control of your online life – making it easy to keep your critical information safe and secure so you can access it whenever you want, wherever you are. Save all your passwords, addresses, credit cards and more in your secure vault and LastPass will automatically fill in your information when you need it.
Stop wasting time getting locked out of accounts or filling passwords and forms online – LastPass simplifies your daily online tasks while keeping you and your family secure.
All your data, where you need it
- Store usernames and passwords and LastPass will log you in automatically
- Fill forms quickly by saving your addresses, credit card numbers and more
- Save passports, insurance cards and anything else you want to keep safe
- All your data is available on any device for free
- Anything you save on one device is instantly synced on all your other devicesProtect yourself from breaches:
- LastPass Security Dashboard provides and overview of your weak and reused passwords and how to improve them
- LastPass dark web monitoring alerts you if your information is at risk
- Generate secure passwords to replace weak ones
- Protect your LastPass account with multifactor authenticationSimplify your life:
- Never forget another password
- Passwords are autofilled for you as you go to your sites - less typing!
- Securely share your passwords with friends and family
- Only worry about one master passwordOnly you know your master password, and only you can access your vault. Your master password is never shared with LastPass. That’s why millions of people and businesses trust LastPass to keep their information safe. We protect your data at every step.
Learn about more features and get LastPass Password Manager for Internet Explorer, Firefox, Safari, Edge, and Opera from www.LastPass.com
3.- SAVE FROM NET helper
SaveFrom.net helper lets you download video and music from YouTube.com, FaceBook.com, Vimeo.com, Daylimotion.com, VK.com, Soundcloud.com and more than 40 others just in one click.
-= HOW TO DOWNLOAD VIDEO=-
On the page where you watch a video file, the "Download" button appears, and allows you to save video in the quality required.-= FEATURES =-
+ download music, video and pictures
+ download all mp3 files from the page
+ check the audio file bitrate and filesize
+ save the playlist to the computer (to listen it later via your player).List of supported resources:
http://en.savefrom.net/faq.php#supported_resoursesAll the additional information can be found on the extension support page.
4.- TRANSLATOR
Translate selected or entered text
Automatically translate foreign texts and pages.
Help to translate typed text, selected text, the active page.
This extension uses services by Google, Bing, Yandex, Promt, Pragma, Baidu, DeepL, Urban Dictionary or Babylon Translator and Dictionaries (optional).How to translate text:
method 1: select required text on any web page and press on extension's button.
method 2: press on extension's button, enter required text in upper field and press "Translate"How to translate web page:
method 1: load required web page, press on extension's button and click on "Translate active page '...'"
method 2: open preferences (right click on extension's button), choose "Default target language" and "Use Translate Toolbar" => each foreign web page will have hint to translate it.You can translate UI on your language. Download list of all words ( ) and send to me ( sailormax@inbox.lv ) edited version.
Known issues:
- simple design. Can anybody offer better?
- Text-To-Speech limited by 100 characters. This is just additional feature, not text reader
- Pragma translator do not support some languages and not always correctly autodetect source language.
- sometimes Pragma don't work. Try manually to open url http://translate.ua/on-line before using it.Privacy notice:
If click on extension-button with yellow rectangle, selected text will translated automatically.5.- TURN OFF THE LIGHTS
With a single click on the lamp button, the page will fade to dark. And automatically focus on the video. By clicking on it again, the page will return to normal.
Turn Off the Lights is a lightweight and useful add-in designed for a more comfortable watching experience. It works for all known video sites such as YouTube, Vimeo, Dailymotion, Hulu, Metacafe, YouKu, etc. Not only this but these extensions are compatible with Google Chrome, Apple Safari, Mozilla Firefox, Opera, Microsoft Edge, Maxthon and Yandex web browsers.
A few great features in this browser extension:
✓ Turn the lights back on, by clicking on it
✓ Support multiple video sites: YouTube, HTML5 video,... and more
✓ Customize your YouTube:
Auto HD: Set videos to play in HD automatically. Users can select from highres > 8K > 5K> 4K > 1080p > 720p > 480p > 360p > 240p > 144p > default
Auto Wide: Automatically plays the video on the widest mode
,... and more
✓ Easter Eggs:
Shortcut key: T -> Do you like a real movie theater feeling?
✓ Option to make the screen dark when the user clicks on the play button
✓ Option to turn on/off the fade in and fade out effects
✓ Custom colors
✓ Option to Flash Detection
✓ Option to Show Dimness Level Bar
✓ Option Eye Protection for when it's night. And with whitelist/blacklist filter
✓ Option atmosphere lighting that shows a glow around the video player
✓ Option to show the dark layer on the top of the window
✓ Options to shortcut keys:
Ctrl + Shift + L to toggle the lights
Alt + F8 to restore the default opacity value
Alt + F9 to save the current opacity value
Alt + F10 to enable/disable the Eye Protection feature
Alt + (arrow up) to increase the opacity
Alt + (arrow down) to decrease the opacity
Alt + * to toggle the lights on all open tabs
✓ Option Camera Motion
✓ Option Speech Recognition
✓ Option for Mouse Wheel Volume Control for each HTML5 video player
✓ Option to add a filter to the current HTML5 video player (grayscale, sepia, invert, contrast, saturate, hue rotation and brightness)
✓ Option to show the Audio Visualization effect on top of the current HTML5 video (Blocks, Frequency and Music Tunnel)
✓ Option to fill the HTML5 video player in your whole current tab
✓ Option to loop the current HTML5 video player
✓ Option to place the Night Mode switch to toggle YouTube in black or white theme. And with whitelist/blacklist filter
Time stamp: Activate the Night Mode within the chosen time
Blackout: Dims the web page and activates the Night Mode
✓ Option to stop YouTube and HTML5 videos from automatically playing.
✓ Option Video Screen capture for YouTube and all the HTML5 video players
One frame snapshot to customize the screenshot with filters such as Invert, Blur, Saturation, Grayscale, Hue rotate etc. And finally save the screenshot as PNG, JPEG, BMP or WEBP image format
✓ Option to Zoom in video player
✓ Option to HTML5 video playback rate
✓ and more...Don't forget to like & Follow Us:
https://www.facebook.com/turnofflights
Google+
https://plus.google.com/+turnoffthelights/posts
https://twitter.com/TurnOfftheLight
https://www.pinterest.com/turnoffthelight
https://www.instagram.com/turnoffthelights
YouTube
https://www.youtube.com/c/turnoffthelightsFeel free to contact us if there is any problem or suggestion.
Compatible with Adblock, AdBlock Pus, uBlock Origin Chrome extension
Note: YouTube is a trademark of Google Inc. Use of this trademark is subject to Google Permissions.6.- TWITTER VIDEO DOWNLOADER
This is not an opera plugin, but it is the best for download from twitter..... TRY IT AND BELIEVE.... or not... haha
Download twitter videos in best quality with one simple click
1 - After installation, you will see a download icon under every tweet, which contains a video. 2 - Simply press download icon. 3 - Video will be downloaded when loading complete.
Your list of add-ons looks great—especially Disconnect and LastPass. They are indeed some of the best privacy and productivity tools out there.