No, this is managed by "findbar.highlightAll" preference in about:config which is false by default.

Hello pciapa1,

Would you try this please :

Type in the address bar about:config and press Enter (promise to be careful, if asked)

Type in the search bar and look for the preference :

findbar.highlightAll and set its value to true

Then close and restart Firefox.

'Hope this does what you want ......

'Looks like TyDraniu and I posted at the same time .....

TyDraniu said

No, this is managed by "findbar.highlightAll" preference in about:config which is false by default.

1. Where there Firefox versions where "findbar.highlightAll" preference was true by default? Is this hard to check?

2. Can this preference be changed not from 'about:config' page? I mean in 'about:preferences' for example?

pciapa1 said

1. Where there Firefox versions where "findbar.highlightAll" preference was true by default? Is this hard to check?

The value is set to "false" by default, so users can choose to enable it - if the default value has ever been "true": I don't know, but I seriously doubt it.

2. Can this preference be changed not from 'about:config' page? I mean in 'about:preferences' for example?

I understand why you ask, but it would be near to impossible to have every users' wishes (and there are maybe many thousands different wishes) in Preferences as an option.

That's why there is the "about:config" page ......