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Browse tabs later. Usage: 1. Click the bookmark icon in the right of address bar to save current tab. 2. Repeat first step to some tabs you want browse it later. 3. Click the bookmark icon on the toolbar restore your saved tabs.

Tips:
If you want open url without remove it, middle-click it, or right click and open link in new tab, or drag it to any position on tabbar you want.Due to Firefox limitation, If you are looking for a more beautiful icon works with both Dark/Light theme, follow steps below:

1. Type about:config in the addressbar, and press Enter.
2. Click the "I accept the risk!" button.
3. Type svg in the searchbar on top of the page, and press Enter.
4. Find preference name "svg.context-properties.content.enabled", double click it, the status will become "modified" and value become "true".

That's it, the icon will looks like built ins.