uBlock doesn't inject/work on homepages that start with browser launch

[ceribik]

Describe the issue

When starting the browser, uBlock origin does not work/inject on the homepages that load when you first start the browser (I have around 10 homepages). You can this tell because: a) there are placeholder ads boxes, b) the element zapper and element picker tools don't work on those pages. If I reload the pages, uBlock starts working again.

This only started happening when I migrated to firefox 57. However, I was also using the webextension version of uBlock origin on Firefox 56 and I did not have this issue.

One or more specific URLs where the issue occurs

https://www.inoreader.com/

Screenshot in which the issue can be seen

https://i.imgur.com/F97ydSv.jpg

Steps for anyone to reproduce the issue

1. Install firefox 57
2. Set a reasonable amount of homepages e.g. 10 (N.B. I have not tested with fewer homepages)
3. Start the browser
4. Watch that uBlock origin does not work or load on the homepages until you refresh them.

Your settings

• OS/version: Arch Linux latest
• Browser/version: Firefox 57
• uBlock Origin version: 1.14.18 on "medium mode"

Your filter lists

Default filter lists

Your custom filters (if any)

N/A

[ceribik]

Shortly after writing this, I investigated the browser console and saw a lot of spam on browser launch from another addon called CanvasBlocker. By disabling and reenabling CanvasBlocker, it allowed uBlock to start working again on browser launch.

I left this here for future reference in case someone else encounters the same issue.

[uBlock-user]

Use ScriptSafe instead of CanvasBlocker, it has a collection of FingerPrinting settings and doesn't break other extensions.

[ceribik]

I'll look into it thanks.

I'm still getting this issue after disabling CanvasBlocker so I've reopened this.

[gorhill]

Duplicate of #1327.