Javascript error on preview when cookies disabled

Problem Description

If cookies are disabled in Firefox 42.0 and onwards - even the latest nightly builds - then C2 will throw a javascript error on preview. The error can be acknowledged and the preview will then work.

Attach a Capx

https://dl.dropboxusercontent.com/u/343 ... tform.capx

Description of Capx

This is just a .capx - not relevant, as any .capx would throw an error.

Steps to Reproduce Bug

• Load .capx in FF 42.0 or newer
• Go to Privacy settings in Options and remove tick from 'Accept cookies from sites'
• run preview - javascript error
• Put tick back in the 'Accept cookies from sites' Privacy option
• run preview - no javascript error

Observed Result

You receive the following error:

This refers to the following in 'preview_prelude.js':

watch = JSON.parse(localStorage.getItem("__c2_watch") || "{}");[/code:2fjdboea]

REMming the line allows FF to preview without the security error.

[b]Expected Result[/b]
No error.
    
[b]Affected Browsers[/b]
[ul]
    [li] Chrome: (NO)
    [/li][li] FireFox: (YES - 42.0 and newer)
    [/li][li] Internet Explorer: (NO)[/li][/ul]
    
[b]Operating System and Service Pack[/b]
Windows 7 Pro SP1
    
[b]Construct 2 Version ID[/b]
r217. Version has no relevance as 'preview_prelude.js' hasn't changed since Feb 2015.

I've seen this error before in Firefox mobile:

I've seen this error before in Firefox mobile:

Ashley asked me to post this here to remind him.

He is going to try and make this

[quote:1drxlx2x]...storage exception-proof.

Does local storage work if you add the address to the cookies exceptions list?

I've always used the exception list - I like to be the one in control.

It just seems that firefox now no longer takes note of the exception list for this case but just checks for the tick in 'Allow cookies'.

This wasn't the case prior to release 42.0 and onwards.

I don't see a "Accept cookies from sites" checkbox in Firefox's privacy settings: https://dl.dropboxusercontent.com/u/15217362/firefoxprivacy.png

Are you using an extension that adds it?

I don't see a "Accept cookies from sites" checkbox in Firefox's privacy settings: https://dl.dropboxusercontent.com/u/15217362/firefoxprivacy.png

Are you using an extension that adds it?

Your settings show the default option of 'Remember History'. It needs to be changed to 'Use Custome settings for history' - https://support.mozilla.org/en-US/kb/settings-privacy-browsing-history-do-not-track

Ah, got it. It's stupid that Firefox throws exceptions there, it will break lots of sites when it could just pretend it worked and then throw away the storage. Anyway, I've exception-proofed the storage for the next build.

Ashley

Many, many thanks. Latest r218 beta works a treat.

Ashley

Firefox 43.0 64/32-bit is now throwing a localstorage error - stupid Mozilla!

Javascript error!
SecurityError: The operation is insecure.
http://192.168.0.6:50000/LocalStorage_plugin.js, line 40 (col 0)[/code:2grnuuy6]

This seems to be ongoing since at lease 2012 [url]http://meyerweb.com/eric/thoughts/2012/04/25/firefox-failing-localstorage/[/url].

zenox98 - can you file a new report to remind me to look at that case? This report is already closed.