Have you verified you are using the most recent version of dashlane? https://www.dashlane.com/

i have tremors very bad so it is extremely difficult to type. I checked dashlane for updates yesterday and it said none. I managed to get it back yesterday, but today mozilla has deleted it from my addons. Yesterday it was still there, but just deactivated.. Right now I could scream, I can't get to anything. Somebody asked if I had tried Firefox Beta,. I don't know anything about it

Please contact Dashlane's support, they can help you with their add-on.

Don't use Beta, it's for more advanced users.

Hi Rosemary, Sorry you are still having problems. Dashlane advertises on Firefox and so even if this is not a problem with Firefox the dashlane software certainly should work and be compatible with Firefox.

I had a quick look on their support site and found this: http://support.dashlane.com/hc/en-us/articles/202699011-How-to-check-your-Dashlane-extension-in-Firefox#title7

Problems with your browser extension?
If Firefox says that Dashlane is incompatible but you're using the latest public release of Firefox, don't worry. You just have to upgrade Dashlane!
For Windows
You just have to upgrade Dashlane and it should be working. To upgrade Dashlane, open Dashlane and select Tools → Check for Updates.

The support page contains further additional information but the info in the box above seems to describe your problem and provide a solution.

If that information does not help then this is their support contact link that you my use to complete a support request form.

• http://support.dashlane.com/hc/en-us/requests/new

I suppose there is a possibility that dashlane is having problems keeping its software up to date with the latest Firefox Releases or Point Releases.