You will be sharing the pages you visit with the extension. It means you have to trust the extension not to send any confidential information to some other party.
The best solution is to contact Postfinance and ask them for a close "X" button on the Offers board. You can do this through the user menu near the logout button and send a message like this:
Dear Sir or Madam,
Please provide an opt-out solution to remove the "Offers" board on the homepage
of the postfinance web app.
My brain and eyeballs belong to me and I am already paying for your service. You
have no right to force blinking advertisements on me like this.
If you consider that it is your right to make some easy money by abusing of people
in this way, I feel very sad that you are taking this route.
Just provide an X button on the offers thingy or an option in the account settings
and keep your customers happy by showing you are a respectful company.
Best regards,
Gaspard Bucher
a happy customer of your services if I feel respected
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Install User CSS plugin
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When on postfinance website, press the [css] button on the top right and type this:
div.lp-efgenericmarketing {
display: none;
}- The "Offers" board should be gone.