HTML5 output project using firefox slow or lag on search

Hello,

I'm using 2022 robohelp.

Everything is working well while i'm generating my project in HTML5.

We are using this project in firefox browser. 

But some words we are searching for made it bug (for exemple the word "ldap" is working good but the word "alto" makes the browser lagging and the word "gestion" is working but slowly like 2 mins before results appear). So it's like a random search depending on the word you are typing.

(We do not have indexes activated, it's only with the search bar)

When it happend we need to close and restart firefox

What can be the cause of this kind of problem ? 

regards,

Stephane