Adblock causing initial lag when opening Firefox

[onefishtwo]

For some time, I found this slight lag occuring in Firefox when opening it for the first time and recently thought it might have been from my only extension. So I disabled Adblock and the lag occuring during first opening Firefox was gone.

Here is a video of it showing the lag especially when typing in address bar right after opening Firefox and then with Adblock disabled showing no lag: https://vid.me/IjOD

[lewisje]

Indeed, Adblock Plus takes a little while to load.