In a statement, the company said it had added Tab Stacks, the ability to group and manage tabs together, six years ago.
The new feature meant stacked tabs could be displayed in a second tab bar, offering a new way to manage tabs on laptops and desktop PCs.
"With Vivaldi’s tab management you can handle an extraordinary amount of information while staying organised," said Vivaldi chief executive Jon von Tetzchner.
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A vertical view of the new Vivaldi feature. Supplied
The original implementation of Stacks meant they took up no more space than a single tab.
"By simply clicking on a stack, one can expand and show the content of the stack, with full-size tabs on a new line," the company said.
"Having full-size tabs means that people can manipulate them like any other tab, using the same methods to open, close, activate, move or select tabs within a stack."
Two-Level Tab Stacks are useful for users who would like to display their stacked tabs in full size. It works whether the tabs are placed on the top, bottom, or to the side.
Two-Level Tab Stacks can also be locked, which avoids changing the page view height when switching between tabs, and makes it easier to create new stacks from any single tab.