It's a feature from Auto Tab Discard add-on. It does look like that in the image when the tab is inactive for certain amount of minutes.
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I also use auto tab discard. This is the only tab to which it prepends a z.
There's a plugin called auto discard. I've used it before but it can cause certain issues with other plugins like simple tabs (it kept duplicating tabs because of the zzzs in front of the name)
I use the "Auto Tab Discard" Addon which can be configured to do this.
There might be a config for it, but I use a plugin called auto tab discard. Very configurable. Saves ram too
Wow! I just logged in here to check for responses, and found all these helpful and useful replies! Thank you all, you are great!