[Uplifted from my comment on suggestion of Muhamed Cicak and to draw more prominence.]
Lastpass has a ‘Never URLs’ option on the account admin page where you can tell it to ignore a URL – useful if you want Lastpass awake but not start interfering with your forms.
To access it:
- Open your Lastpass vault
- Open Account Settings
- On the top of the window there is a list of options – select ‘Never URLs’
- There are options for ‘Never Add Site’, ‘Never Fill Forms’ and ‘Never Do Anything’. Use the Add button to add a URL.
[EDIT] Additionally there is an accepted answer for page authors in a SO answer here which says to add
data-lpignore="true"
to tell lastpass to ignore it.