Merge Named Browser Windows
Merges browser tabs if there is existing tab with same name.
Merge Named Browser Windows - Firefox Add-on
Merge Named Browser Windows is a Firefox add-on that introduces a behavior around named windows on Internet Explorer. It disallows opening multiple tabs with the same name and only keeps the newest or oldest tab.
Add-on stats
Weekly download count: 3
Firefox on Android: No
Risk impact: High risk impact 
Risk likelihood:
Manifest version: 2
Permissions:
- storage
- tabs
- <all_urls>
Size: 19.13K
URLs: Website
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
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Add-on summary
In short: this introduces a behavior around named windows on the Internet Explorer.
When a named browser window is opened via JavaScript code like window.open("...", "subwindow", "width=400,height=400") Firefox allows to open two or more tabs for same name, if they are opened from different tabs. This extension disallows to open such multiple tabs with same name, instead leave only one tab for each name - newest or oldest.
Add-on safety
Risk impact
Merge Named Browser Windows requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Merge Named Browser Windows has earned a fairly good reputation and likely can be trusted.
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