One of my scripts already used this technique (injecting code into the 
content scope).  It still seems to work find after the update: saving and 
re-loading data to localStorage
works fine, and the changes persist when you close the browser and re-load.

On Friday, 17 November 2017 19:46:06 UTC, 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
>
> On Fri, Nov 17, 2017 at 9:17 AM, Evgeniy <[email protected] 
> <javascript:>> wrote:
>
>> It seems this mailing list won't be a boring place for some time after 
>> Mozilla has released its 57 Quantum and Anthony struggles with GM 4…
>> I'm updating my 20+ scripts now and experience this problem. 
>> localStorage.set("some", "thing") works fine in one tab and I can even 
>> leave that web page and visit it again, and localStorage.get("some") 
>> returns "thing" to me. Also I see all my values in Firefox's Developer / 
>> Storage Inspector. But I don't see my data in other tabs I open with that 
>> same web page, and when I close FF and open it again, all my data is gone. 
>> Basically, it doesn't save it between sessions. On the other hand, cookies 
>> are saved as usual.
>> I guess it has something to do with new security model in which our GM 
>> scripts run. Checking about:config, I see various keys like 
>> dom.storage.enabled and dom.storageManager.enabled and (unrelated?) 
>> devtools.storage.enabled all set to true.
>> Anybody knows what's happened in GM 4 with respect to this API and how to 
>> make it work as before?
>>
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