Chrome extension for limiting the total number of tabs you can have open
You can either explicitly set a limit on the number of tabs you want open, or set a limit on the memory usage of Chrome, and have tabs killed automatically. The latter requires your browser to support the processes API.
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Clone this repository
git clone https://github.com/punchagan/xtab.git
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Enable "Developer mode" in your Extensions page (Tools -> Extensions)
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Load this extension, using the "Load unpacked extension" button on the extensions page.