How do I automatically insert a plugin on all tracks at the same time?

[Undertones]

I want to use ATA on all tracks, first in the chain. How do I do this without manually adding the plugin on the first insert bar each time?

[Kobra]

Hold down the option-key when inserting the plug.
If you want, you can select all the tracks that you want the plug on and hold down shift+option.

[Top Jimmy]

Just know that if you insert the first one on a mono track, it will only put them on the mono tracks. Ditto for stereo tracks.

[Stiff]

... And if you only want it on most of the tracks (i.e. not master fader for example) select the tracks you want it on and hold down shift+option.