chore: Add Browser agent v1.243.1 release notes

src/content/docs/release-notes/new-relic-browser-release-notes/browser-agent-release-notes/browser-agent-v1.243.1.mdx

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+---
+subject: Browser agent
+releaseDate: "2023-10-04"
+version: 1.243.1
+features: []
+bugs: ["Improve Session Replay abort metric reliability"]
+security: []
+---
+
+## v1.243.1
+
+### Bug fixes
+
+#### Improve Session Replay abort metric reliability
+Pass Session Replay abort metrics through the event emitter buffer to guarantee that early lifecycle failures are captured by the Metrics feature for prioritizing future improvements.
+
+## Support statement:
+
+New Relic recommends that you upgrade the agent regularly to ensure that you're getting the latest features and performance benefits. Older releases will no longer be supported when they reach [end-of-life](https://docs.newrelic.com/docs/browser/browser-monitoring/getting-started/browser-agent-eol-policy/). Release dates are reflective of the original publish date of the agent version.
+
+New Browser Agent releases are rolled out to customers in small stages over a period of time. Because of this, the date the release becomes accessible to your account may not match the original publish date. Please see this [status dashboard](https://newrelic.github.io/newrelic-browser-agent-release/) for more information.
+
+Consistent with our [browser support policy](https://docs.newrelic.com/docs/browser/new-relic-browser/getting-started/compatibility-requirements-browser-monitoring/#browser-types), v1.243.1 of the Browser agent was built for and tested against these browsers and version ranges: Chrome 108-117, Edge 108-116, Safari 15-16, and Firefox 108-117. For mobile devices, v1.243.1 was built and tested for Android Chrome 100-117 and iOS Safari 15.5-16.2.