Firefox add-on with keyword - ctrl+m (windows)

Tabby helps you manage a lot of windows and tabs easily; it can help you open, close, move, pin, and do many other things on tabs and windows quickly. With Tabby, you can even save all you windows and tabs for later with just one click!

Merges the tabs from multiple windows together into one window. Extension won't show context menu item when there aren't more than one window of the same type to merge together. Private windows will only merge with private windows not normal.

Quickly resize the window to one of your favorite sizes

Label your windows and profiles using custom window titles.

Move tab to standalone window, without tabs bar, navigation bar and bookmark bar UI.

Sign in to supported websites with accounts on Windows 10. Ported from the Chrome's Windows 10 Accounts extension.

Windows XP Luna Theme for Firefox

Easily set the layout (size & position) of your browser window

windows 7 basic theme

For those who miss 2007!

Classic Windows color theme for Firefox (blue title line, white background, black text)

Click to merge all currently opened windows into single one

The Windows 10 default blue theme.

Resize the browser window. The resolution list supports customization.

A theme to match Window's default blue color scheme.

Open your Microsoft Visio files for free

Merge specified browser windows into each other. Or all of them into one. Simply right click to open Firefox’s context menu when multiple windows are open, or configure a keyboard shortcut. All wrapped up in one tiny free extension.

Windows 95 theme for windows 10. Created using Firefox Color: https://color.firefox.com

Private windows are now purple. When you open a new private window, the appearance of the other windows changes, so in the extension settings, select the theme you are using.

This was an attempt at recreating the default Windows 10 Firefox theme. I'm not a Windows user, but I love the default theme Firefox has on Windows, and couldn't find a replacement for it online. So, I made one myself. :)

Very old Windows color theme.

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Looks like the Windows 9x series

A theme based on the Windows 10 default color option: Mint Light

This is a theme that makes your firefox browser look like its windows 11 dark bloom. With this you can now become blue dabadabeeda