userstyles.org - Google mail inbox favicon notifier *Flashing* I/B

This style adds a flashing envelope to notify you when you have new mail in your inbox, this works great with the 'app tabs' addon: [*]

NOTE 1: This is the version that works with tab text "Inbox" only.

NOTE 2!: Depending on whether your mail tab is entitled "Google Mail", "Gmail" or just "Inbox" you will have to install a different style.

Gmail:
[*] - Alternating Envelope
[*] - Flashing Envelope
[*] - Static Envelope

Google Mail:
[*] - Alternating Envelope
[*] - Flashing Envelope
[*] - Static Envelope

If your tab title says only "inbox":
[*] - Alternating Envelope
[*] - Flashing Envelope
[*] - Static Envelope