Starting Vivaldi
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Startup options for Vivaldi are configured in Settings > Startup > Startup with section.
Last Session
With this option selected, the browser will open with the Tabs and Windows that were open last time you closed Vivaldi;
When the browser is set to open with the last session, a good option to make it go faster is to Lazy Load the tabs. That way only the active tab is loaded and other Tabs will fully load only when you go to them.
Furthermore, in case you’ve set the browser to open with the Last Session, but for some reason your previous tabs were not restored, click the 
Closed Tabs button on the far end of the Tab Bar or in the Window Panel to view and reopen recently closed Tabs and Windows.
Homepage
The browser will open with the page you’ve chosen as your homepage in Settings > General > Startup > Homepage.
Start Page
Opens Vivaldi on the Start Page with your Speed Dials;
Specific Pages
Vivaldi can also start by opening a specific web page or multiple pages of your choice.
To open multiple web pages every time you start Vivaldi:
Option 1
- Go to Settings > General > Startup > Startup with;
- Select Specific Pages as the Startup with option;
- Enter a web page’s URL;
- Click Add;
- Repeat steps 2 and 3 until all the pages you want open on startup are listed.
Option 2
- Have only these web pages open, that you want the browser to open with;
- Go to Settings > General > Startup > Startup with;
- Select Specific Pages as the Startup with option;
- Click on Use Current Pages.
To remove a site from the list, click on 
Remove page next to the URL field.