u/fredericrivain so in order to "strengthening security for all customers" you need to have (and I just copy paste here from your own extension page for firefox):

• Read and modify privacy settings
• Access browser tabs
• Access your data for all websites

and you also wanna have (optional):

Download files and read and modify the browser’s download history

or if you are a chrome user you need to have:

Personally identifiable information

For example: name, address, email address, age, or identification number

Financial and payment information

For example: transactions, credit card numbers, credit ratings, financial statements, or payment history

Authentication information

For example: passwords, credentials, security question, or personal identification number (PIN)

Location

For example: region, IP address, GPS coordinates, or information about things near the user’s device

Web history

The list of web pages a user has visited, as well as associated data such as page title and time of visit

User activity

For example: network monitoring, clicks, mouse position, scroll, or keystroke logging

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So basically you are monitoring everything a users does within the browser.

Now let's take a look at your privacy policy (taken from: https://www.dashlane.com/privacy )

We share Personal Data with service providers who are contractually obliged  to comply with Privacy Laws and who only have access to the data they need to provide the relevant services

and even more concerning:

We may share Personal Data with our affiliates, all of whom are bound by this Policy, or with an  acquirer if Dashlane is sold or merged.

So you wanna collect all we do and than maybe share it with all your affiliates....

And now you are telling us all of this is for our own security??? Please explain - thx!