The idea is good, but execution could be better. Sometimes it opens a new tab, sometimes it replaces the current tab.

EDIT:

This is the best of the best in this category of apps by far in terms of UI.

Performance suffers with a large number of tabs (hundreds of tabs)

Search isn't "fuzzy" or smart, it searches only for exact strings (see TabSearch extension or Vivaldi's built-in search for contrast)

Ctrl+A -> backspace often doesnt backspace anything and just goes to the start of your text. However, I've seen this bug in several other extensions of this type, which leads me to believe it's a browser bug.