WebExtensions: Content script accessing storage.local

Add-ons Development
#1

Hi,

Trying to figure out a way to handle settings in the extension.

I assume chrome.storage.local is the way to do it, yet it is not available to the content script. Is this correct?

To side-step this, I send a message to background script (chrome.runtime.sendMessage()), where it is possible to call chrome.storage.local.get() for the specified key. Yet it seems that handling of “return true” is not properly implemented (yet? https://bugzilla.mozilla.org/show_bug.cgi?id=1202481 mentions it, but it seems stuck for over a week now), so I cannot call sendResponse() from inside the .get() callback.

Please let me know if there is a working way to get keys from local storage to content script, or if I just need to wait till this part of the functionality is complete.

#2

Hmmm…

Same obstacle with making AJAX calls—the site I need to use the extension on (GitHub) doesn’t allow scripts to load data from outside sources, yet a call from background script works (which is great!). But I can’t pass the response to that call back to content script, since sendResponse() doesn’t work from an asynchronous callback.

#3

OK, found one possible workaround—in the callback in the background script, instead of calling sendResponse() (which doesn’t work), I can send a message to the tab that called bg.js in the first place.

Sooo… it is possible to implement, but takes “Callback Hell” to a new level. I really hope there is a better solution, or that handling of “return true” will be implemented soon.

#4

Theres no pref system?

That’s how addons do it, we write a preference to about:config and delete it on uninstall.

stoarge is mostly for actualy storage of data/files etc

#5

If there is a preference API with WebExtensions, I would definitely like to know about it.

#6

At the moment no access to Fx pref system. And for content scripts is access to local storage planned but not yet available.

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#7

I suspect we’ll be implementing the options_page API at some point in the future, but I don’t think it’s there yet.

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