Thanks you for a quick reply, Anthony!
It appears the problem is in my profile somewhere. After creating a new
clean profile localStorage began saving data well between browser
stops/restarts. I can't find exact settings in about:config or anywhere
else which rules this behaviour. I compared both prefs.js but found
nothing, and these files seem incomplete either (about:config listing is
much longer than these js files).
What I can't explain is that you say WebStorage API shouldn't work with
Firefox 57+ due to the new security model for WebExtensions. But in my
installation it works now:
var users = localStorage.getItem("my_script__users_list") || "[]";
As simple as this. Can't tell why this works.
But I'll note the Content Scope Runner technique you mention for cases when
nothing else helps.
On Friday, November 17, 2017 at 10:46:06 PM UTC+3, Anthony Lieuallen wrote:
>
> So in Greasemonkey 1.0 - 3.x, @grant none made this "just work", but in
> GM 4 we don't have the right APIs to retain that feature. Does your script
> use any GM APIs? If not, does this technique help?
>
> https://wiki.greasespot.net/index.php?title=Content_Scope_Runner&oldid=7215
>
>
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