Toolbar icon
The toolbar icon of uBlock Origin (uBO) informs you about the state of uBO and what it is doing.
The normal state of uBO is to be enabled and fully ready to filter, which is represented by the usual uBO icon:
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The toolbar icon badge reports the number of network requests blocked on the current webpage.
If you disable uBO for a given site, the toolbar icon will be grayish, which indicates that no filtering will occur:
When you launch uBO, it needs to load all settings and filter lists in memory to be able to filter properly. When uBO is not yet ready to filter properly, the toolbar icon will be yellowish:
A yellowish toolbar icon badge means some network requests were fired by the browser while uBO was not ready to filter properly, potentially leading to ads/trackers/etc. not being filtered in some of the already opened webpages:
The yellowish badge will persist once uBO is ready to filter properly, to remind you that the current webpage was not properly filtered:
To address the improper filtering that occurred on a webpage, you can simply force a reload of that webpage, which as a result will bring back the badge to be rendered as expected.