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Mozilla Firefox has an issue right now that is causing conflicts if multiple extensions are installed that modify CSP headers on visited sites.

CSP, which stands for Content Security Policy, is a security addition that sites may use to detect and mitigate certain attack types such as Cross Site Scripting or data injections.

Browser extensions may use CSP injection to modify headers. The popular content blocker uBlock Origin may use it to block remote fonts from loading on pages visited in the browser, and Canvas Blocker uses it to block data URL pages.

Source: Firefox CSP Issue may cause extension conflicts - gHacks Tech News